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Is the Universe Finite or Infinite?
Two possiblities exist: either the Universe is finite and has a size, or it's infinite and goes on forever. Both…
How Do We Know Dark Energy Exists?
We have no idea what it dark energy is, so how are we pretty sure it exists? I've talked about…
This Is The Asteroid That Didn’t Hit Us
All right, sure – there are a lot of asteroids that don't hit us. And of course quite a few…
New Horizons Now Close Enough to See Pluto’s Smaller Moons
Now on the final leg of its journey to distant Pluto the New Horizons spacecraft has been able to spot…
The First Images Are In from Rosetta’s Valentine’s Day Comet Flyby
On Saturday, Feb. 14, the Rosetta spacecraft swooped low over the surface of comet 67P/C-G in the first dedicated close pass…
Rosetta’s Comet Really “Blows Up” in Latest Images
First off: no, comet 67P/Churyumov-Gerasimenko is not about to explode or disintegrate. But as it steadily gets nearer to the Sun the…
How Fast is the Universe Expanding?
The Universe is expanding, but how quickly is it expanding? How far away is everything getting from everything else? And…
Do Stars Move?
We know that Earth is not the center of the universe -- let alone the Solar System -- but looking…
Don’t Look At Black Holes Too Closely, They Might Disappear
We've come a long way in 13.8 billion years; but despite our impressively extensive understanding of the Universe, there are still…
Dawn Captures Best Images Ever of “Hipster Planet” Ceres
This is the second animation from Dawn this year showing Ceres rotating, and at 43 pixels across the images are officially the…