A Glimpse at the Universe Beyond Our Planet

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The universe contains billions upon billions of stars and galaxies, with an infinite number of planets orbiting them. Some scientists even suspect that there might be as many planets in the universe as there are stars, which would mean that there could be as many alien worlds out there as there are objects in our own galaxy! As powerful as telescopes are today, though, only about 15% of the universe can be observed from Earth, because so much of the light reaching us from space was created long before our solar system formed about 4 billion years ago.

 

Our Solar System

The eight planets—Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune—are made of rock and gas. Each orbits our sun in an elliptical orbit that traces its own path through space.

 

Milky Way Galaxy

The Milky Way Galaxy is a spiral galaxy. It is estimated to be about 100,000 light-years in diameter and contains about 200-400 billion stars. A light-year is approximately 6 trillion miles and can be thought of as how far light can travel in one year. The universe has been expanding since it was first created 13.7 billion years ago, meaning that all of these vast distances are continually growing larger with time.

 

The universe beyond our planet

The Sun isn’t even close to being big compared to some of our neighboring stars. In fact, there are more stars in our galaxy than there are grains of sand on every beach and desert on Earth. That’s a lot of stars! So let’s take a look at some other galaxies besides ours.


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