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Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: Happy equinox! What is the equinox and why does it matter? And, most importantly, how can you experience it?
September 22, 2026
Sun
Sun news: 3 events to notice on today’s sun
Sun news September 22, 2026: We're poised for the September equinox. And we speak of 3 events today: the return of sunspots, C flares and fast solar wind.
Earth
Fat Bear Week 2026: Here’s how to participate!
It's time for Fat Bear Week 2026! Vote for your favorite corpulent cutie as the brown bears of Katmai National Park fatten up for winter.
September 22, 2026
Astronomy Essentials
Are day and night equal on the equinox? Not exactly
Are day and night equal at an equinox? No. There's slightly more day than night on the day of an equinox. Find out why here.
September 22, 2026
Space
JUICE mission to fly by Earth next week! Details here
The JUICE mission will perform a flyby of Earth next week on September 28. The spacecraft is headed toward Jupiter's icy moons, where it will arrive in 2031.
September 22, 2026
Human World
6th batch of Pentagon UAP files: Air Force talk and more
The 6th batch of the Pentagon UAP files has just been released. Read about a U.S. Air Force talk on UAP from 1952, see more videos and more.
September 20, 2026
Favorite Star Patterns
Great Square of Pegasus gallops into the autumn sky
The Great Square of Pegasus consists of 4 stars of nearly equal brightness in a large square pattern. It's a great jumping-off point for star-hopping.
September 20, 2026
Tonight
The equinox sun rises due east and sets due west
The 2026 September equinox occurs at 00:05 UTC on September 23, 2026. And the equinox sun rises and sets due east and due west.
September 20, 2026
Earth
Scientists discover a new tiger cat hiding in plain sight
Scientists studying the tiger cat have found 5 distinct species, revealing more diversity among these familiar-looking wild cats than previously known.
September 19, 2026
Astronomy Essentials
International Observe the Moon Night 2026 is tonight
International Observe the Moon Night is September 19, 2026. It's a global event for celebrating the moon. Here's how you can participate online or in person.
September 19, 2026
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