Finally, the Earth moves a little bit beyond one complete revolution, so the stick again points towards the sun for a second local noon. The sidereal day is just a little bit shorter—approximately 23 ...

For those north of the equator, the solstice marks the longest day and the shortest night of the year. The Earth spins on a ...

I was looking forward to writing a tribute to clear summer skies and great summer stargazing in the Pacific Northwest.

The star Polaris marks the North Celestial Pole in our sky, around which all other objects in the heavens appear to rotate.

The Solar Orbiter spacecraft, a joint mission between the European Space Agency and NASA, is the first to venture into a ...

The finals of the Icebreaker of Knowledge international scientific and educational initiative took place at the ATOM Museum in VDNKh ...

Here is everything to know about the northern lights this week, including whether they will be visible in Arizona. The northern lights will actually be visible in 15 states tonight: Alaska. Washington ...

We Earthlings see the sun every day of our lives—but gaining a truly new view of our star is a rare and precious thing. So ...

The European Space Agency's Solar Orbiter, in collaboration with NASA, has captured unprecedented images of the Sun's south ...