The Sun, our nearest celestial neighbor, is undeniably a star, not a planet, as centuries of astronomical observations have confirmed. However, the boundaries of celestial definitions are continually ...

The sun arrives at the December solstice at 10:03 a.m. EST on Dec. 21. This is the farthest south the sun gets in the heavens; it begins its six-month return northward at the moment winter begins in ...

Which planet is the furthest from the sun? Some may think it’s Pluto, but it’s actually Neptune. Learn more about this ice ...

Still, science being science, we needed proof—and we got it in 1992, when two astronomers found two planets orbiting a pulsar ...

January is a good month for interesting planetary alignment. You will have a lot going on in the night sky. For most of the month, six out of the eight planets will be visible in the heavens. Mercury ...

The flare might just inspire a display of Northern Lights even in Illinois, Oregon, Alabama, and Northern California.

The Sun's formation caused temperature differences in the surrounding disk of gas and dust. Inner, hotter regions formed rocky planets from less volatile elements. Outer, colder regions allowed ...

It's time once again for the Perseid meteor shower! Meteors from this annual celestial display are remnants from the ancient comet Swift-Tuttle, which orbits the sun and deposits debris every 133 ...

Six planets are hanging out in the sky this month in what’s known as a planetary parade. Catch the spectacle while you can because it’s the last one of the year. These linkups happen when several ...

Kuiper is an outer region of the Solar System that extends from the orbit of the planet Neptune, called Edgeworth , about 30 ...