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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.
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.
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.
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.
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.
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?
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.
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.
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.
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.