Watch the Nancy Grace Roman Space Telescope Launch and the Fastest Star in our Galaxy Approach the Milky Way's Black Hole

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This week in the world of astronomy, watch the fastest known star in our galaxy approach Sgr A* and the launch of the Nancy Grace Roman Space Telescope. Plus, enjoy Tuesday's daytime Jupiter occultation.

This Week's Sky at a Glance, September 4 – 13

Venus is sinking down and away. The Sagittarius Teapot pours out its tea as summer nears its end. Saturn rises around nightfall.

NASA Launches Nancy Grace Roman Space Telescope

Launched on August 30th, NASA’s newest flagship space observatory will go a long way toward filling in our understanding of questions on the forefront of astronomy and cosmology.

Star Feels Spin of Milky Way’s Black Hole

The fastest known star in our galaxy comes so close to Sgr A* that the black hole’s rotation may pull it off course, enabling a first-of-its-kind detection.

Gaps in Stellar Streams May be Common — and Not a Sign of Dark Matter

A new study shows that gaps in such stellar streams can easily arise without the need for dark matter.

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Observing Highlights

I Spy the Moon

Tracking the phase, moonrise, and nightly position of the Moon can help give a tempo to life and its seasons.

Tuesday's Daytime Jupiter Occultation a Warm-Up for the "Big One"

A daytime occultation to whet your appetite for next month’s spectacular show.

Demystifying Flat-Frame Calibration

Many astrophotographers skip flat fields because they seem complicated. But the flats can greatly improve your images — here's how to do them.

September Podcast: Vega & Its Vicinity

This episode takes you on a tour of the stars and planets that you’ll see overhead during September.

Presented by: Celestron.

Second Saturday Stars

Our monthly open house star party held the Second Saturday of each month. There is a presentation at the beginning followed by night sky viewing.

Chabot to Open Brand New Exhibit: Shared Sky: Photos of Our Universe

On October 10th, Chabot's largest exhibition space will showcase the intersection of science and art through photography. Shared Sky is designed to captivate visitors’ imaginations and curiosity with the stunning artistic work of astrophotographers, local and global, and the masterpiece imagery from the great space telescopes like Hubble and Webb, and soon to come Roman. The exhibition will be open to the public beginning Saturday, October 10, 2026 through October 2027.