A light year is the distance light travels in one year. Even though it looks instantaneous to us, light actually takes time to travel, just like everything else. Light from the sun takes about 8 minutes to reach Earth.

Yes! The universe is expanding all the time. Every other galaxy is rushing away from our galaxy, like dots on an inflating balloon.

Very cold - about -454.81 degrees Fahrenheit, which is only 2 degrees above absolute zero, the coldest it's possible to be.

If the universe is expanding, it makes sense to ask what exactly it’s expanding into. Again, no one knows, but one theory is that our universe is just one of many universes, all very far apart from one another and set in a sort of “super-universe.”

Scientists who study space, who are called astronomers, estimate that there are at least 100 billion planets. Of these, we’ve so far confirmed just over 5,000 of them. Planets outside of our solar system are called Exoplanets. And of those, almost 60 are potentially habitable, according to NASA.

The Milky Way Galaxy is shaped like a spiral, with multiple arms spinning around. It is around 100,000 light years across - that means if you turned on a flashlight at one end of the Milky Way, it would take the light 100,000 years to reach the other side.

If you took everything in the Milky Way and weighed it, it would altogether weigh as much as 1.5 trillion Suns.