Hubble Spotted New Evidence That Dark Matter Is "Cold"

We don't know what dark matter is, because we can't detect it. But new observations from Hubble could illuminate dark matter's true identityand the role it plays in the fate of our universe.
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Thanks to new observations using the Hubble Space Telescope, scientists believe they have strong evidence for one of the most widely accepted and coolest dark matter theories yet: cold dark matter.

Cold refers to the slow speed at which the particles move, with hypothetical warm and hot dark matter particles moving faster. These slow moving cold dark matter particles are the only dark matter particles that can congregate in smaller clumpsso small, in fact, that astronomers devised a new way of searching for them using the Hubble Space Telescope.

Astronomers used the telescope to hunt for quasars, the regions around active black holes where superheated matter emits tons of light. But not just any quasar would doHubble had to find a quasar that was almost perfectly aligned behind an entire massive galaxy.

Find out more about how the technique known as gravitational lensing works, and how these latest observations could advance our understanding of dark matter in this Elements.

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Read More:
New Observations From Hubble Could Confirm a Leading Theory on Dark Matter
https://www.sciencealert.com/tiny-clumps-of-dark-matter-affirm-cold-dark-matter-theory
"We don't actually know what dark matter is. We can't directly detect it. What we do know is that the Universe doesn't behave entirely as it should if we apply our current physics to what we can directly observe."

What is Dark Matter? Even the Best Theories Are Crumbling
https://www.discovermagazine.com/the-sciences/what-is-dark-matter-even-the-best-theories-are-crumbling
"Weve built incredibly sensitive, bizarre instruments to look for them. These include vats of liquid xenon stored miles underground, and telescopes looking for dark matter particles decaying into things we can see and measure, like gamma rays. It includes the Large Hadron Collider, one of the most expensive science experiments ever built. And we havent found them."

Cosmic conundrum: Just how fast is the universe expanding?
https://astronomy.com/magazine/news/2019/04/cosmic-conundrum-just-how-fast-is-the-universe-expanding
"Right now, cosmologists calculate that the universe is 13.8 billion years old, based on Plancks H0 of 67.4. But if H0 is actually closer to 73, it could shave hundreds of millions of years off the universes age, depending on what changes would be required in Lambda CDM. And more importantly, a resolution of the Hubble tension could also shed light on dark energy, which controls the universes ultimate fate."
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