See Interstellar Comet 3I/ATLAS and the Pleiades's 3,000 Lost Siblings

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Read news from the world of astronomy for the week of November 21, 2025.

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This week in the world of astronomy, see the Pleiades's 3,000 Lost Siblings. Plus, read S&T's review of the ZWO Seestar S30 smartscope.

Comet K1/ATLAS Crumbles, Interstellar Comet 3I/ATLAS Delights

Watch an Oort Cloud comet disintegrate before your eyes. Meanwhile, interstellar intruder 3I/ATLAS is brighter than expected.

Updates on Interstellar Comet 3I/ATLAS: NASA Images, Many Tails, Non-gravitational Forces

Now that Comet 3I/ATLAS has emerged from the Sun’s glare, its behavior is being monitored by every available observatory.

The Sun Left Home in a Hurry

By exploring the edge of the solar system, astronomers have estimated how long our star stuck around its siblings after birth.

Meet the Seven Sisters’ 3,000 Lost Siblings

The Pleiades star cluster is part of a much larger complex that stretches across the entire sky, a new study shows.

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Observing Highlights

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This Week's Sky at a Glance, November 21 – 30

Saturn's rings are turning as edge-on as we will see them for another 15 years. The planet awaits your scope high in the evening sky. Low in the dawn, the thin Moon approaches Venus.

Spot Uranus at Opposition

Uranus is its closest to Earth all year on the night of November 21st, and you can find it easily in the evening sky using Sky & Telescope’s exclusive star chart.

November Podcast: Five Fascinating Stars

In this month’s Sky Tour astronomy podcast, we’ll watch two sets of shooting stars, point out a few late-autumn constellations, and put a spotlight on five interesting stars.

Presented by: Celestron.

Winter Stargazing: A Journey Through the Night Sky

Learn about the wonders of your universe and what’s up in the sky this winter!

S&T Test Report: The ZWO Seestar S30 Telescope

This pintsized powerhouse takes images of the night sky that will surprise even seasoned astrophotographers.

iAFS is a new family of drift-free, inline, computer-controlled focusers by iOptron. Utilizing a lead worm movement iOptron calls “iLock technology” freezes the imaging train at the desired focal distance. These revolutionary focusers have precise 0.6 micron movement, built-in temperature sensor and 3 focus modes (computer controlled, power manual, no power focus wheel). It’s all packaged in a rugged machined body with a finger print resistant coating. The iAFS focuser will be available in 2-, 3-, and 4-inch models.

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