We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

Discover when the next full moon will rise in July 2025, why it's called the Hungry Ghost Moon, and what celestial events to watch for.

It's officially summer, and with that comes the first full moon of the season. July's full moon -- known as the Buck Moon or ...

"Theories involving substantial formation of stars prior to or together with the black hole formation and growth are very ...

Some of the faintest, coldest stars in the universe may be powered not by fusion—but by the annihilation of dark matter deep ...

The search for dark matter requires all the best models, theories, and ideas we can throw at it. A new paper by Julia Monika Koulen, Stefano Profumo, and Nolan Smyth from the University of California ...

July's full "Buck Moon" will be at its fullest on Thursday, July 10, and will be best seen at moonrise. It is the farthest ...

On July 7, skywatchers will see a bright moon near red supergiant star Antares in the southeastern sky after sunset. It's one ...

To get a glimpse of the “Swift Planet,” EarthSky suggests waiting for the sun to set before looking west for the planet during twilight time. Nearly a week after Fourth of July fireworks illuminate ...

The "Golden Handle" appears each month when the sun illuminates a mountain range lining a vast impact crater. Saturday night ...