Up here on the International Space Station I don ... in and out of the light from the Sun, moving between day and night. Image caption, The part of the Earth facing the Sun is lit up, making ...

Undeniable is that the Sun’s rays are essential to life on Earth, while the day-night cycle (as ... of the notion of trying space mirrors for chasing the night away. When it is not ruining ...

Earth rotates on its axis every 23.9 hours, defining day and night for surface dwellers. This axis of rotation is tilted 23.4 degrees away from the plane of Earth's orbit around the sun ...

The Earth's tilt of approximately 23.5 degrees on its axis is the primary reason for the occurrence of the winter solstice ...

The winter solstice is today, bringing the shortest day and longest night of the year to the Northern Hemisphere.

As the Earth travels around the Sun, it does so at an angle. For most of the year, the Earth’s axis is tilted either toward ...

Moon phases reveal the passage of time in the night sky ... of the moon is facing away from Earth, toward the sun. The moon is also in the sky during the day, and without its Earth-facing side ...

December’s full moon, dubbed the cold moon, will reach the crest of its full phase early Sunday. Here’s the best way to view ...

These "massive fireballs" that blow out of the Sun's outermost layer can significantly affect the weather on Earth and satellites in space, said BBC News. A single CME "could weigh up to a ...