Scientists estimate there are 100 billion stars in Earth’s galaxy.
FOREVER SKIES FULL
If stars are like houses, then galaxies are like cities full of houses. If you could ride on the fastest space probe NASA has ever made, it would still take you thousands of years to get there. To get to the next nearest star, you would have to travel through trillions of miles of space. You might know that the sun is actually just an average star, and looks bigger and brighter than the other stars only because it is closer. Image via Mark Garlick/ Science Photo Library via Getty Images. The Earth is part of a group of planets that all orbit the sun – with some orbiting asteroids and comets mixed in, too.
Planets, stars and galaxiesĪt the beginning of your trip through space, you might recognize some of the sights. But there are some things we don’t know yet, like whether space just goes on forever. Have you ever wondered what it would be like to travel to outer space – and then keep going? What would you find? Scientists like me are able to explain a lot of what you’d see. It’s called that because it has far fewer molecules, with lots of empty space between them. Floating around the atmosphere is a mixture of molecules – tiny bits of air so small you take in billions of them every time you breathe.Ībove the atmosphere is space. It extends about 20 miles (32 km) above the Earth. Right above you is the sky – or as scientists would call it, the atmosphere. What is beyond outer space? – Siah, age 11, Fremont, California Image via Stijn Dijkstra/ EyeEm/ Getty Images. Some people say they feel “panic” when pondering the vastness of outer space.
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