Earth

Overview
Earth is the largest of the inner planets and is the 5th largest overall.

History
Earth is around 4.5 billion years old. In the past, Earth was a really hot planet, maybe even as hot as Venus is. There was no way that life could have existed there. But over time, it got cooler. The first life forms on earth were microbes. And life didn't die out. Life on earth went from aquatic to land. Earth had survived a lot of stuff. No one really knows how humans got here. It could be 400,000 years ago, or more. Over time, humans inhabited the earth. Humans designed so much stuff, like technology. Humans started to spread fossil fuels. More and more animals are becoming extinct.

Earth is getting warmer...
Since we are spreading more fossil fuels, it is starting to make the earth warmer. Like a greenhouse, Venus's and Earth's atmosphere are making the two planets warm. Some fossil fuels are good, however, too much of a good thing is a bad thing.

How we can help

 * Walk more: since cars produce fossil fuels which can harm the planet, we can use electric cars or we can walk.
 * Plant more trees: trees don't just provide shade, they provide oxygen too. Trees are getting cut down each year.
 * Use solar energy: there are many solar panels used all over the world.

There are so many ways we can help the planet.

It's moon
It is possible that Earth could have more than one moon. But there is one moon that is visible every night and that is:

The moon.