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Today's Image
2021’s Harvest Moon: Favorite photos so far
A handful of photos of 2021's Harvest Moon, from the EarthSky Community. Check back! The Harvest Moon photos are still coming in.
September 21, 2021
Astronomy Essentials
Year’s fastest sunsets happen around equinoxes
The year's fastest sunsets are at the equinoxes, and the slowest are at the solstices. We're talking about the minutes needed for the sun to sink below the horizon.
September 21, 2021
Space
Asteroid 2021 SG came from the sun’s direction
Asteroid 2021 SG - 4 times the diameter of 2013's Chelyabinsk meteor - passed near Earth without being previously detected on September 16, 2021.
September 20, 2021
Astronomy Essentials
Harvest Moon 2021: All you need to know
In 2021, the Northern Hemisphere's Harvest Moon falls on September 20, or less than 2 days before the autumn equinox.
September 20, 2021
Astronomy Essentials
Ceres at opposition, coming up November 27
Ceres at opposition on November 27. Now begins the best time to observe it. On November 6 and 7, Ceres will sweep past bright Aldebaran.
September 20, 2021
Human World
Space
U.S. and China: Cooperation or competition in space?
Between the U.S. and China: Will it be collaboration or competition that defines international space science and exploration in the 21st century?
September 19, 2021
Human World
What is time, and why does it move forward?
What is time, and why does it move forward? Cosmologist Thomas Kitching of University College London explains how the arrow of time points to the future.
September 19, 2021
Space
Planets are born in cosmic organic soups
Astronomers have found that planets form in cosmic soups of organic molecules. These soups have different ingredients, leading to a wide diversity of planets.
September 18, 2021
Space
Sex in space: Time to talk about it?
Sex in space has been a taboo subject for decades. But, these authors point out, it'll be necessary for the survival of the human race.
September 17, 2021
Astronomy Essentials
What are red giants?
What are red giants? Most main-sequence stars, like our sun, will become one. Red giants swell to such a large size they can swallow their inner planets.
September 17, 2021
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