Guide to Space
The Orbit of Earth. How Long is a Year on Earth?
Ever since the 16th century when Nicolaus Copernicus demonstrated that the Earth revolved around in the Sun, scientists have worked…
How Quickly Do Black Holes Form?
A star can burn its hydrogen for millions or even billions of years. But when the party's over, black holes…
What is the Difference Between Asteroids and Comets?
Asteroids and comets have a few things in common. They are both celestial bodies orbiting our Sun, and they both…
Where’s All The Antimatter?
One of the biggest mysteries in the Universe is the fact there there's matter, and not antimatter. Where did it…
What’s Causing The Universe To Expand?
We've all heard that the Universe is expanding, but why is it expanding? What's the force pushing everything outwards? If…
Why Doesn’t The Sun Steal The Moon?
The Sun has so much more mass than the Earth. So, so, so much more mass. Almost everything in the…
What Did Isaac Newton Discover?
Sir Isaac Newton was a major figure of the Scientific Revolution, and of the most influential minds that ever lived.…
When Did the First Stars Form?
Shortly after the Big Bang, the Universe had cooled to the point that the first stars could form out of…
How Does a Rocket Work?
Rockets are the perfect way to get around in space. But how do they work? Space travel and rockets, it’s…
How Big Is The Big Dipper?
The Big Dipper is big. Come on, it's right there in the name. But how big is the Big Dipper…