Moons of Uranus – Facts for Kids
William Herschel was the first person ever to discover a planet. In 1781 he discovered the planet which was named Uranus for the ancient Greek sky god. Although Uranus has at least 27 moons, most of them weren't discovered until the Space Age.
Betelgeuse – Red Supergiant
Betelgeuse is the star that represent's Orion's right shoulder. It's also one apex of the Winter Triangle and marks the center of the Winter Hexagon. Very bright, distinctly red, and part of the hunter's commanding presence, you can find it easily in the winter sky.
Heroes of the Revolution – Doodles
For umpteen centuries people thought the Earth was the center of the cosmos. In the 2nd century AD, this view was the foundation for Ptolemy's Almagest and it persisted into the 18th century. But it wasn't unchallenged, there was a revolution in the making.
Triton – Captive Moon of Neptune
The Solar System's big moons are weird and wonderful, and Triton is no exception. It has ice volcanoes. Its "cantaloupe terrain" is unique in the Solar System. It's unlike the other large moons. And it orbits in the wrong direction, so it didn't form near Neptune. But where did it come from?
While World War I was tearing Europe apart in 1915, a German physicist presented a theory that would shake up the way we see the Universe. The physicist was Albert Einstein, his face still unknown to the world, his name not yet a synonym for genius. How did a solar eclipse in 1919 change all that?
Absolute Beginners - Seeing Mercury and Venus
We can see five planets with our unaided eyes. But people often ask how to find them and how to recognize them. Here is a beginner's guide for seeing Mercury and Venus.
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