Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...

Sound as we know it does not exist in space. That’s because, on Earth, sound mainly travels to our ears via vibrating air molecules. Because space is a vacuum, meaning there is no matter at all ...

Billions of years ago, the fourth planet from the sun could have been mistaken for Earth’s smaller twin, with liquid water on its surface—and maybe even life. Now, the world is a cold ...

After learning these fundamentals of geography, kids will have a few fun facts to impress grandma ... geography is actually ...