Search Results: "Category:Astronomy"
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12:19 Popular
Uranus & Neptune: Crash Course Astronomy #19
2,266 views / 13 likes - addedToday we’re rounding out our planetary tour with ice giants Uranus and Neptune. Both have small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue. Uranus has a truly weird rotation and relativ
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09:46 Popular
Moon Phases: Crash Course Astronomy #4
1,976 views / 6 likes - addedIn this episode of Crash Course Astronomy, Phil takes you through the cause and name of the Moon's phases. -- Why the Moon Has Phases 0:36.1 Spheres in Orbit 1:05.4 Name of the Moon Phases 2:25.5 How We See It 7:48.2 -- PBS Digital Studios: http://youtube
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10:34 Popular
Light: Crash Course Astronomy #24
1,666 views / 0 likes - addedIn order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and color. Spectroscopy allows us to analyze those colors and determine an object’s temperature, dens
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10:18 Popular
Mercury: Crash Course Astronomy #13
1,318 views / 10 likes - addedMercury is the closest planet to the sun. It has no atmosphere and is, as such, covered in craters. It's also incredibly hot but, surprisingly, has water ice hiding beneath its surface. -- Table of Contents Closest Planet to the Sun 0:03 Rotation Locked t
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10:44 Popular
Jupiter: Crash Course Astronomy #16
1,299 views / 5 likes - addedJupiter is the biggest planet in our solar system. The gas giant is NOT a failed star, but a really successful planet! It has a dynamic atmosphere with belts and zones, as well as an enormous red spot that’s actually a persistent hurricane. Jupiter is sti
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10:50 Popular
Venus: Crash Course Astronomy #14
1,134 views / 6 likes - addedVenus is a gorgeous naked-eye planet, hanging like a diamond in the twilight -- but it’s beauty is best looked at from afar. Even though Mercury is closer to the sun, Venus is the hottest planet in the solar system, due to a runaway greenhouse effect, and
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09:47 Popular
Tides: Crash Course Astronomy #8
1,101 views / 1 likes - addedToday Phil explores the world of tides! What is the relationship between tides and gravity? How do planets and their moons become tidally locked? What would happen if you were 300km tall? Important questions. -- Gravity Over Distance 0:44 Tidal Force Para
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02:51 Popular
Collisions and Explosions in the Universe
1,087 views / 0 likes - addedOn the smallest to the largest scales, collisions and explosions happen all over our Universe. Join the Royal Observatory Greenwich astronomers as they uncover some of the most explosive events in space.For School Groups: https://www.rmg.co.uk/schools-com
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12:16 Popular
Saturn: Crash Course Astronomy #18
1,060 views / 6 likes - addedSaturn is the crown jewel of the solar system, beautiful and fascinating. It is a gas giant, and has a broad set of rings made of ice particles. Moons create gaps in the rings via their gravity. Saturn has dozens of moons, including Titan, which is as big
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10:17 Popular
Introduction to the Solar System: Crash Course Astronomy #9
989 views / 1 likes - addedIn today's Crash Course Astronomy, Phil takes a look at the explosive history of our cosmic backyard. We explore how we went from a giant ball of gas to the system of planets and other celestial objects we have today. This episode is sponsored by Squaresp
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12:17 Popular
High Mass Stars: Crash Course Astronomy #31
981 views / 1 likes - addedMassive stars fuse heavier elements in their cores than lower mass stars. This leads to the creation of heavier elements up to iron. Iron robs critical energy from the core, causing it to collapse. The shock wave, together with a huge swarm of neutrinos,
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09:51 Popular
The Moon: Astronomy #12
962 views / 1 likes - addedJoin Phil for a tour of our capital-M Moon, from surface features, inside to the core, and back in time to theories about its formation. This episode is brought to you by Squarespace: http://www.squarespace.com/crashcourse -- Table of Contents Many Millio
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12:36 Popular
A Brief History Of The Universe: Crash Course Astronomy #44
955 views / 0 likes - addedThanks to the wonders of physics, astronomers can map a timeline of the universe’s history. Today, Phil’s going to give you an overview of those first few minutes (yes, MINUTES) of the universe’s life. It started with a Big Bang, when the Universe was inc
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13:23 Popular
The Big Bang: Crash Course Astronomy #42
951 views / 0 likes - addedThanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly its expanding also allows us to run the clock backwards 14 billion years to the way the universe began - with a
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12:26 Popular
Black Holes: Crash Course Astronomy #33
943 views / 3 likes - addedWe’ve covered a lot of incredible stuff, but this week we’re talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a very massive star dies, and its core collapses. The core has to be more than about 2.8 times the Su
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12:03 Popular
Low Mass Stars: Crash Course Astronomy #29
904 views / 0 likes - addedToday we are talking about the life -- and death -- of stars. Low mass stars live a long time, fusing all their hydrogen into helium over a trillion years. More massive stars like the Sun live shorter lives. They fuse hydrogen into helium, and eventually
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02:53 Popular
What is Light?
904 views / 0 likes - addedOur Universe is a vast and very interesting place and light plays a big part in us being able to understand more about it. To find out how join the Royal Observatory Greenwich astronomers as they explore more.For School Groups: https://rmg.co.uk/plan-your
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10:12 Popular
Mars: Crash Course Astronomy #15
898 views / 3 likes - addedThe fourth planet from the sun and the outermost of the terrestrial planets, Mars has long been a popular spot for missions and imagination. Phil walks you through the planet's topography, core, and features. We'll take a look back to Mars's past and make
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10:14 Popular
The Earth: Crash Course Astronomy #11
889 views / 0 likes - addedPhil starts the planet-by-planet tour of the solar system right here at home, Earth. -- Table of Contents Earth is a Planet 0:03 Layers of Earth 1:25 The Magnetic Field 5:10 Atmosphere and the Human Influence 6:14 -- PBS Digital Studios: http://youtube.co
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10:32 Popular
Eclipses: Crash Course Astronomy #5
840 views / 0 likes - addedThe big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse -- As promised, Phil's sun spotting recommendations: Astronome
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02:50 Popular
The Story of Stars
812 views / 0 likes - addedHave you ever looked up at the night sky and wondered about the stars? What makes them so special? Why are some even different colours? Join the Royal Observatory Greenwich astronomers as they explore the science behind the different types of stars in our
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10:30 Popular
Jupiter's Moons: Crash Course Astronomy #17
810 views / 1 likes - addedBefore moving on from Jupiter to Saturn, we’re going to linger for a moment on Jupiter’s moons. There are 67 known moons, and 4 huge ones that we want to explore in greater detail. Ganymede is the largest - larger, in fact, than any other moon in the sola
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11:23 Popular
Everything, The Universe...And Life: Crash Course Astronomy #46
807 views / 1 likes - addedHere it is, folks: the end. In our final episode of Crash Course Astronomy, Phil gives the course a send off with a look at some of his favorite topics and the big questions that Astronomy allows us to ask. Thank you for watching. -- Crash Course Astronom
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12:04 Popular
The Sun: Crash Course Astronomy #10
804 views / 2 likes - addedPhil takes us for a closer (eye safe!) look at the two-octillion ton star that rules our solar system. We look at the sun's core, plasma, magnetic fields, sunspots, solar flares, coronal mass ejections, and what all of that means for our planet. This epis
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11:14 Popular
The Milky Way: Crash Course Astronomy #37
792 views / 0 likes - addedToday we’re talking about our galactic neighborhood: The Milky Way. It’s a disk galaxy, a collection of dust, gas, and hundreds of billions of stars, with the Sun located about halfway out from the center. The disk has grand spiral patterns in it, formed
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12:57 Popular
Neutron Stars: Crash Course Astronomy #32
788 views / 1 likes - addedIn the aftermath of a 8 – 20 solar mass star’s demise we find a weird little object known as a neutron star. Neutrons stars are incredibly dense, spin rapidly, and have very strong magnetic fields. Some of them we see as pulsars, flashing in brightness as
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14:05 Popular
Gamma-Ray Bursts: Crash Course Astronomy #40
780 views / 1 likes - addedGamma-ray bursts are not only incredible to study, but their discovery has an epic story all its own. Today Phil takes you through some Cold War history and then dives into what we know. Bursts come in two rough varieties: Long and short. Long ones are fr
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00:44 Popular
Count By Category | Counting | Early Math | Khan Academy
780 views / 0 likes - addedLearn to count the number of things in different categories. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-counting-topic/cc-early-math-comparing-numbers/e/sort-groups-by-count?utm_so
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10:03 Popular
The Gravity of the Situation: Crash Course Astronomy #7
774 views / 0 likes - addedIn today's episode, Phil looks at how gravity plays out across the universe. This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse -- Gravity is a Force 2:17 Different Types of Orbit 3:41 Escape Velocity 5:30 Weightless Mass 7:0
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06:30 Popular
Decoding the ancient astronomy of Stonehenge
746 views / 1 likes - addedThe solstice alignments of Stonehenge, explained. Subscribe to our channel! http://goo.gl/0bsAjO Note: A previous version of this video referred imprecisely to "Neolithic Britain" when discussing the Newgrange tomb in Ireland. We have removed that phrasin
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11:55 Popular
Comets: Crash Course Astronomy #21
745 views / 0 likes - addedToday on Crash Course Astronomy, Phil explains comets. Comets are chunks of ice and rock that orbit the Sun. When they get near the Sun the ice turns into gas, forming the long tail, and also releases dust that forms a different tail. We’ve visited comets
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12:01 Popular
Binary And Multiple Stars: Crash Course Astronomy #34
741 views / 0 likes - addedDouble stars are stars that appear to be near each other in the sky, but if they’re gravitationally bound together we call them binary stars. Many stars are actually part of binary or multiple systems. If they are close enough together they can actually t
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15:15 Popular
Deep Time: Crash Course Astronomy #45
736 views / 0 likes - addedAs we approach the end of Crash Course Astronomy, it’s time now to acknowledge that our Universe’s days are numbered. Stars will die out after a few trillion years, protons will decay and matter will dissolve after a thousand trillion trillion trillion ye
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12:12 Popular
Introduction to Astronomy: Crash Course Astronomy #1
732 views / 3 likes - addedWelcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the Bad Astronomer himself, Phil Plait. We begin with answering a question: "What is astronomy?" -- Table of Contents: What is Astronomy? 3:00 Who Studie
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11:33 Popular
Asteroids: Crash Course Astronomy #20
730 views / 1 likes - addedNow that we’ve finished our tour of the planets, we’re headed back to the asteroid belt. Asteroids are chunks of rock, metal, or both that were once part of smallish planets but were destroyed after collisions. Most orbit the Sun between Mars and Jupiter,
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11:41 Popular
The Oort Cloud: Crash Course Astronomy #22
702 views / 0 likes - addedNow that we’re done with the planets, asteroid belt, and comets, we’re heading to the outskirts of the solar system. Out past Neptune are vast reservoirs of icy bodies that can become comets if they get poked into the inner solar system. The Kuiper Belt i
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12:06
Galaxies, Part 1: Crash Course Astronomy #38
690 views / 0 likes - addedThe Milky Way is our neighborhood in the universe. It’s a galaxy and there are many others out there. Galaxies contain gas, dust, and billions of stars or more. They come in four main shapes: elliptical, spiral, peculiar, and irregular. Galaxies can colli
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12:01
Telescopes: Crash Course Astronomy #6
678 views / 0 likes - addedToday Phil explains how telescopes work and offers up some astronomical shopping advice. -- How Telescopes Work 1:07 Refractors vs Reflectors 2:50 Technology and the Light Spectrum 7:45 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow P
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11:17
Naked Eye Observations: Crash Course Astronomy #2
676 views / 0 likes - addedToday on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with your naked eye. -- Table of Contents: Naked Eye Observations 0:28.4 Constellations 3:09.7 The Color of Stars 2:44.5 View of the
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15:35
Galaxies, Part 2: Crash Course Astronomy #39
671 views / 0 likes - addedActive galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in smaller groups and larger clusters. Our Milky Way is part of the Local Group, and will one da
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01:51
Why Hurricane Categories Make a Difference
670 views / 3 likes - addedDuring a hurricane you usually hear meteorologists refer to its intensity by categories. If you don't know the difference between a category 1 and a category 5 hurricane, The Weather Channel meteorologist Mark Elliot breaks it down for you.
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11:06
Brown Dwarfs: Crash Course Astronomy #28
665 views / 0 likes - addedWhile Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall just short of that achievement as well called brown dwarfs. Brown dwarfs, have a mass that places them between giant plane
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05:27
The 1995 Hubble photo that changed astronomy
665 views / 0 likes - addedThe Hubble Deep Field, explained by the man who made it happen. Subscribe to our channel! http://goo.gl/0bsAjO Click here to download the Hubble Deep Field images: http://www.spacetelescope.org/science/deep_fields/ /// Vox.com is a news website that helps
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11:21
Distances: Crash Course Astronomy #25
655 views / 2 likes - addedHow do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to find the size of the Earth, and from that the distance to and th
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11:22
Meteors: Crash Course Astronomy #23
650 views / 2 likes - addedToday Phil helps keep you from ticking off an astronomer in your life by making sure you know the difference between a meteor, meteorite, and meteoroid. When the Earth plows through the stream emitted by a comet we get a meteor shower. Meteors burn up abo
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10:41
Stars: Crash Course Astronomy #26
649 views / 0 likes - addedToday Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity
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09:29
Cycles in the Sky: Crash Course Astronomy #3
637 views / 0 likes - addedThis week we build on our naked eye observations from last week and take a look at the cyclical phenomena that we can see at work in the universe. -- Table of Contents: Naked Eye Observations 0:28.4 Constellations 3:09.7 The Color of Stars 2:44.5 View of
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10:17
Gravitational Astronomy? How Detecting Gravitational Waves Changes Everything
632 views / 0 likes - addedWe’ve now had multiple detections of gravitational waves, opening up a whole new field: gravitational astronomy. We talk about the detections made so far, and how we can see the Universe in a whole new way. Support us at: http://www.patreon.com/universeto
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12:00
Dark Matter: Crash Course Astronomy #41
624 views / 1 likes - addedToday on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn’t all there is. Galaxies and other large structures in the universe are created and shifted by a force we detect mostly indirect
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11:23
Dark Energy, Cosmology Part 2: Crash Course Astronomy #43
620 views / 0 likes - addedThe majority of the universe is made up of a currently mysterious entity that pervades space: dark energy. We don’t know exactly what it is, but we do know that dark energy accelerates the expansion of space. We think this means the Universe will expand f
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11:50
Exoplanets: Crash Course Astronomy #27
607 views / 1 likes - addedToday Phil explains that YES, there are other planets out there and astonomers have a lot of methods for detecting them. Nearly 2000 have been found so far. The most successful method is using transits, where a planet physically passes in front of its par
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02:22
Newton's Laws of Motion
607 views / 0 likes - addedJoin our Royal Observatory Greenwich astronomers as they go on an epic journey to find out how Newton's Laws of Motion work in space. Buckle your seatbelts, you are in for an adventure.For School Groups: https://rmg.co.uk/plan-your-visit/schools/royal-obs
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12:16
Nebulae: Crash Course Astronomy #36
603 views / 2 likes - addedAstronomers study a lot of gorgeous things, but nebulae might be the most breathtakingly beautiful of them all. Nebulae are clouds of gas and dust in space. They can glow on their own or reflect light from nearby stars. When they glow it’s usually predomi
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04:07
New Astronomy Technique Reveals Monster at the Center of the Milky Way
582 views / 1 likes - addedStripping away the Milky Way's stars, planets, rocks and dust reveals a massive black hole lurking just 26,000 light years from Earth. | For more STRIP THE COSMOS, visit http://www.sciencechannel.com/tv-shows/strip-the-cosmos/#mkcpgn=ytsci1 Subscribe to S
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10:36
Star Clusters: Crash Course Astronomy #35
579 views / 0 likes - addedLast week we covered multiple star systems, but what if we added thousands or even millions of stars to the mix? A star cluster. There are different kinds of clusters, though. Open clusters contain hundreds or thousands of stars held together by gravity.
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04:17
The Most Important Astronomy Picture Ever Taken
571 views / 0 likes - addedhttp://gplus.to/TonyDarnell http://twitter.com/DeepAstronomy http://facebook.com/SpaceFan I've recently discovered an animation that was rendered using the measured redshift of all 10,000 galaxies in the Hubble Ultra Deep Field image. I've written a short
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11:10
White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30
522 views / 0 likes - addedToday Phil follows up last week’s look at the death of low mass stars with what comes next: a white dwarf. White dwarfs are incredibly hot and dense objects roughly the size of Earth. They also can form planetary nebulae: huge, intricately detailed object
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03:57
This Could Be the End of Urban Astronomy (360 Video)
504 views / 0 likes - addedCity lights are blinding our view of space, and its forcing urban astronomers to rethink the way they make observations. To make matters worse, a change in the type of lights being used could be the end of some observatories. Plunging Down an Ice Track at
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03:50
Sundials = Astronomy with a Stick!
420 views / 1 likes - addedScience doesn't have to be complicated. In fact, for most of the history of our investigation of the universe we used nothing more than sticks and stones. Just because they are old doesn't mean they aren't cool though. Right? If you want to check out more
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05:16
Here's Why Zodiac Constellations Are Still Used in Astronomy
353 views / 1 likes - addedTo understand astronomy, astrology might actually not be a bad place to start... Although scientists certainly havent proven that being an Aries makes you more impatient or a Libra means youre wise, the constellations in the zodiac have unlocked hidden se
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02:20
How to Make Galaxy Goo
350 views / 0 likes - addedFind out how to make your own Galaxy Goo in Astronomy at Home.Galaxies are huge collections of stars, dust and gas, gravitationally bound together in space. Stars shine different colours depending on their temperature. Hot, young stars are blue and older,
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02:10
Shadows On Other Worlds
339 views / 0 likes - addedJoin the astronomers at the Royal Observatory Greenwich as they go on an adventure to discover what shadows look like on other worlds.For School Groups: https://rmg.co.uk/plan-your-visit/schools/royal-observatory #ROGschools #ROGAstronomers #Universe #Ast
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12:35
The New Astronomy: Crash Course History of Science #13
336 views / 0 likes - addedThis week on Crash Course: History of the Scientific Revolutionastronomical anomalies accrued. Meanwhile, in Denmarkan eccentric rich dude constructed not one but two science castles! And his humble German assistant synthesized a lot of new, old, and bold
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03:10
Are there aliens?
329 views / 0 likes - addedLife began on the Earth around 3.5 billion years ago. Could life have evolved on other planets and if so, where are they? Astronomers at the Royal Observatory Greenwich explain how we might detect them in this video.For School Groups: https://rmg.co.uk/pl
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02:21
Exploring Moons
307 views / 0 likes - addedOur Moon is just one of many moons in the solar system. Join Royal Observatory Greenwich astronomers as they explore some of the different properties and characteristics of a few weird and interesting moons orbiting around the other planets.For School Gro
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04:31
What's inside a black hole?
304 views / 0 likes - addedROG astronomer Rad explains where black holes come from, how we know they're there and the strange effects they have on surrounding matter. We also find out what would happen if ROG astronomer Liz approached one!For School Groups: https://rmg.co.uk/plan-y
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02:20
How to make NebulArt
291 views / 0 likes - addedFind out how to make your own NebulArt in Astronomy at Home.Nebulae are regions of gas and dust in space where stars form. They emit light in many different wavelengths but humans can only see a small portion of this light - visible light. Thankfully, we
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04:43
How big is the Universe?
279 views / 0 likes - addedROG astronomer Liz shows us the expanding nature of the Universe and how this affects the light reaching us from distant galaxies, some of which will remain forever hidden from our view.For School Groups: https://rmg.co.uk/plan-your-visit/schools/royal-ob
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03:26
Where does Space begin?
278 views / 0 likes - addedHave you ever wondered how far away space is; how far are the different things you see above your head? Join the Royal Observatory Greenwich astronomers as they ascend up through the different layers of the Earths atmosphere to reveal what we would see at
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03:35
Infrared astronomy - with Matthew Bothwell
135 views / 0 likes - addedWhy does the universe look the way it does? The answer could lie in the massive, dusty, and star-producing galaxies that existed billions of years ago, and are invisible to the naked eye.Watch Matthew Bothwell's full lecture on 'The Invisible Universe': h
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