Why isn't Pluto a planet?
Pluto, officially a dwarf planet, has surprising complexity on its surface. While certainly a world, not everyone agrees it is a planet.
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Pluto, officially a dwarf planet, has surprising complexity on its surface. While certainly a world, not everyone agrees it is a planet.
"Stuff your eyes with wonder, live as if you'd drop dead in ten seconds. See the world. It's more fantastic than any dream made or paid for in factories." -Ray Bradbury It wasn't all that long ago -- back when I was a boy -- that the only planets we knew of were the ones in our own Solar System. The rocky planets, our four gas giants, and the moons, asteroids, comets, and kuiper belt objects (which was only Pluto and Charon at the time) were all that we knew of.
NASA Hubble might have another successor. Here's what you need to know about the new SSST (Solar System Space Telescope).
Planet Mercury is the sun's nearest planetary neighbor. It has short years, long days, huge surface temperature fluctuations and really weird sunsets.
Mars, Saturn, and Venus are soon forming a triad that’ll bless the night sky right before sunrise. The planets are easily observable with a telesco...