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Astronomy Essentials
Neptune at opposition to the sun this weekend
Neptune at opposition - when it's 180 degrees from the sun on the sky's dome - comes early on September 21, 2024. You'll need optical aid to spot it.
September 20, 2024
Sun
Sun news September 20: Exciting sunspot regions, front and back
Sun news for September 20, 2024. The front and far sides of the sun both have interesting sunspot regions. Will they bring more activity?
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide for September 2024. Neptune at opposition this weekend. Catch up with pics and video from Tuesday's partial lunar eclipse.
September 20, 2024
Astronomy Essentials
Are day and night equal on the equinox?
Are day and night equal at an equinox? No. Earth's atmosphere and our sun team up to give us more day than night during an equinox.
September 20, 2024
Astronomy Essentials
Equinox sun above horizon all day at the poles
We know the equinox sun rises due east and sets due west. But what happens at Earth's poles? Does the sun look exactly the same at both poles?
September 19, 2024
Earth
Space
We’re getting better at seeing asteroids that may hit Earth
Astronomers are getting better at spotting asteroids, such as the asteroid that hit Earth near the Philippines on September 5, 2024. Read more.
September 19, 2024
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 how long it takes the sun to sink below the horizon.
September 19, 2024
Today's Image
Super Harvest Moon and eclipse pics here!
The Super Harvest Moon on September 17, 2024, was briefly darkened by Earth's shadow in a partial lunar eclipse. Check out some great photos of the event here!
September 18, 2024
Space
New Cloud Atlas of Mars for cloudspotting on the red planet
Want to do some cloudspotting on Mars? Researchers in Germany have created the new Cloud Atlas of Mars, with 20 years of images from the Mars Express orbiter.
September 18, 2024
Human World
Did social isolation drive Neanderthals to extinction?
New DNA studies of a Neanderthal from France support a theory that Neanderthals became extinct because their populations were isolated, leading to inbreeding.
September 18, 2024
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