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Earth At Aphelion

What are Perihelion and Aphelion?

The Earth is closest to the Sun—or, at the perihelion—about 2 weeks after the December Solstice ...
Black Hole

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

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 Droplet

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...
North Pole

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...
North Pole

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...