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Human World
Did humans drive Cyprus dwarf hippos and elephants extinct?
A new study shows that now-extinct dwarf hippos and elephants on the island of Cyprus were likely driven to extinction by humans about 14,000 years ago.
September 22, 2024
Space
Spaceflight
Mars mission to send Blue and Gold satellites to red planet
The Mars ESCAPADE mission will study the red planet's magnetosphere using a pair of small satellites. ESCAPADE will launch no earlier than spring 2025.
September 22, 2024
Sun
Sun news September 22: Happy Sun-day and equinox!
Sun news for September 22, 2024. It is a quiet Sun-day on the sun. Happy September equinox to all! Solar activity is low. But auroras are more likely around the equinox. Good luck, aurora watchers.
September 22, 2024
Human World
Equinox shadows trace a straight line from west to east
Equinox shadows are unique. On this day - and only this day - the tip of an upright stick's shadow follows a straight path, west to east, all day long.
September 21, 2024
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide for September 2024. Today brings the September equinox, when the sun rises and sets directly east and west worldwide.
September 21, 2024
Earth
Did Earth have rings 466 million years ago?
Did Earth have rings eons ago? A new study suggests that Earth had its own ring system 466 million years ago, which formed from the breakup of an asteroid.
September 20, 2024
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
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
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