Earth Articles

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What Are Perihelion and Aphelion?

Earth reaches at its closest approach to the Sun near midnight on January 4–5, 2020. We call this...

Where in Space Are We Headed?

Want to be amazed? Look skyward on the next clear night. With your own eyes, you’ll be able to see...

Mars at Opposition 2018 | The Red Planet’s Close Approach

We’re about to see one of the truly great sky events of 2018. First, Mars’ best opposition in 15...

Water Shouldn't be Wet! Why Water's Amazing

Water shouldn’t really be wet! It shouldn’t be liquid. It should be a gas. After all, all other...

Santa's Dilemma: When North Poles Shift or Disappear

Even as Arctic air is freezing us this December, the North Pole is moving farther away! If you...

Shifty Poles: When Magnetic Poles Flip

When most people think of the North Pole, they think of Santa Claus and his workshop of jolly elves...