Sky This Week is brought to you in part by Celestron. Friday, December 12Ganymede reappears from occultation behind Jupiter ...

The moon's surface may be more than just a dusty, barren landscape. Over billions of years, tiny particles from Earth's ...

Clocks on Mars tick faster by about 477 microseconds each Earth day, a new study suggests. This difference is significantly ...

SpaceX is planning an initial public offering that may be the world’s biggest ever. Its revenue is forecast to be between $22 ...

When the Sun reaches its lowest point in the sky, which always occurs around December 21 for those of us in the northern ...

Can India overcome years of delays to finally send its own spacecraft astronauts into orbit? That depends on crucial launches ...

The phenomenon of a Full Moon arises when our planet, Earth, is precisely sandwiched between the Sun and the Moon. This alignment ensures the entire side of the Moon that faces us gleams under ...

When is winter? Weather forecasters in the Northern Hemisphere will tell you Dec. 1 through the end of February, which is ...

Discover how the International Space Station was built, from Zarya and Unity in 1998 to Destiny, helping you understand each ...