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Astronomy Essentials
Forms of aurora: Arcs, curtains, coronas and more
Here are some of the forms of aurora that you might see. Some are more common, such as diffuse glows, while others are a sign of a big geomagnetic storm.
September 18, 2026
Sun
Yes, there’s an aurora season, and it’s here
There's an aurora season around the equinoxes, due to the way the magnetic fields of the sun and the Earth work in conjunction with sun-Earth geometry.
Today's Image
Huge new Webb image is chock-full of space delights
ESA has unveiled a spectacular new Webb image. One of the largest shots yet, it features protostars, jets, distant spiral galaxies and a gravitational lens.
September 17, 2026
Earth
1st adult T. rex trackway found by high school teacher
A high school teacher discovered 4 footprints that make up the 1st-ever known T. rex trackway. He discovered it at Hell Creek Formation in North Dakota.
September 17, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: Look for the waxing crescent moon near red Antares this evening. And see a video explaining the equinox.
September 17, 2026
Astronomy Essentials
See the year’s fastest sunsets and sunrises around equinoxes
The year's fastest sunsets and sunrises happen around the equinoxes, and the slowest sunsets and sunrises happen around the solstices.
September 17, 2026
Astronomy Essentials
Equinox fun: Track the sun’s shift now until the solstice
On this equinox, start tracking the sunset point on your western horizon. You'll see a mighty shift between now and the June solstice.
September 17, 2026
Astronomy Essentials
2026 September equinox: All you need to know
The September equinox is almost here! Autumn for the Northern Hemisphere. Spring for the Southern Hemisphere. Here's all you need to know.
September 17, 2026
Sun
Sun news: A spotless day today?
Sun news September 18, 2026: Are we looking at a sun spotless day today? It has no been declared officially but it seems no sunspots today.
September 17, 2026
Earth
Wildfires near the South Pole burned 90 million years ago
Researchers have found evidence in a sediment core in Antarctica that wildfires near the South Pole were a regular occurrence some 90 million years ago.
September 16, 2026
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