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The fourth planet from the Sun. Mars is nicknamed the "red planet" because its rust-colored soil glows a dim, reddish hue. The early Romans were f...

the size of our universe has baffled scientists throughout the ages. Even Einstein called his lack of understanding for the workings of the univer...

We've long been fascinated by that bright, ever-changing fixture of our night sky. Inspired by our artist's interpretation of the moon, each weight...

Named for the god of the sea in ancient Roman mythology, Neptune is a distant and mysterious ice giant. The pale blue world lies nearly 3 billion m...

The discovery of this ghostly greenish-blue world literally doubled the size of our Solar System, since ancient astronomers believed Saturn's orbit...