I also studied the night sky with a telescope from the roof of my apartment building. I knew I would be an astronomer when I grew up. By studying astronomy, I have learned lots of mind-boggling things . Astronomy is a BIG subject . It's full of gigantic objects, enormous distances, incredible speeds, and extreme temperatures.
Astronomers estimate that the universe is billions of years old.
The temperature inside the Sun is millions of degrees. Light from distant stars can travel for millions of years and trillions of miles before it reaches us. By using careful observations and tools, astronomers have learned a lot about our solar system, our galaxy and beyond.