Caltech Astronomy

Caltech Astronomy We are the Caltech Astronomy and Astrophysics Department. Check here for announcements and updates for our various public outreach events.

What makes a solar eruption extreme? Why are some eruptions from the Sun far more powerful than others, and how can spac...
09/11/2026

What makes a solar eruption extreme? Why are some eruptions from the Sun far more powerful than others, and how can spacecraft help us understand what drives these events? We recently hosted solar physicist Gabriel Muro to discuss the physics behind extreme solar eruptions at Astronomy on Tap. His presentation is now up on YouTube:

https://www.youtube.com/watch?v=gYNdxau3XfI

Photos by Robb Rosenfeld

Join us this weekend, September 11–13, for the Sequoia Dark Sky Festival, featuring science talks, astrophotography, tel...
09/10/2026

Join us this weekend, September 11–13, for the Sequoia Dark Sky Festival, featuring science talks, astrophotography, telescope viewing, and more amid the stunning landscapes of the Sierra Nevada!

Caltech scientists will give talks on asteroids, supernovae, cosmology, and the surprising contents of seemingly empty space, and we'll host an “Ask an Astrophysicist” Q&A panel. We'll also be at Saturday night's star party with telescopes, including a radio telescope we'll use to detect hydrogen gas in the plane of the Milky Way!

Come join us for a fun weekend of astronomy under the stars! The festival is free and open to the public; park entry is not included.

Do you like nature, dark skies, and astronomy? Join us in two weeks for the Sequoia Dark Sky Festival, September 11–13! We'll be joining the National Park Service and Sequoia Parks Conservancy for a weekend of stargazing, telescope viewing, science presentations, family activities, and more.

Caltech scientists will give public talks on asteroids, cosmology, exploding stars, and the surprising contents of “empty” space. We'll also host an Ask an Astrophysicist panel, where you can bring your questions about astronomy, physics, and space science.

The festival is free and open to the public; park entry is not included. We hope to see you there!

https://sequoiaparksconservancy.org/dark-sky-festival/

09/09/2026

Our very own Professor Vikram Ravi discusses the mysterious phenomena of Fast Radio Bursts.

Last month, we teamed up with Lassen Volcanic National Park for Dark Skies at Lassen, a weekend of stargazing and scienc...
09/08/2026

Last month, we teamed up with Lassen Volcanic National Park for Dark Skies at Lassen, a weekend of stargazing and science under some of California's darkest skies! We had great weather, beautiful views, and lots of astronomy throughout the weekend.

We're looking forward to doing it all again this coming weekend at Great Basin and Sequoia National Parks. Hope to see some of you under the stars!

We'll be in Nevada this weekend for the Great Basin Astronomy Festival, featuring science presentations, astrophotograph...
09/07/2026

We'll be in Nevada this weekend for the Great Basin Astronomy Festival, featuring science presentations, astrophotography, and telescopes in some of the darkest skies in the USA. Join us for astronomy as well as mountains, trails, and the oldest living trees in the world! Event is in coordination with Great Basin National Park, and everything including entry to the park is free!

What happens when a star ventures too close to a supermassive black hole? How can a black hole's gravity literally tear ...
09/04/2026

What happens when a star ventures too close to a supermassive black hole? How can a black hole's gravity literally tear a star apart, and what happens to the stellar debris afterward? We recently hosted black hole researcher Xiaoshan Huang to discuss these phenomena, known as Tidal Disruption Events, at a recent Astronomy on Tap. Her presentation is now up on Youtube:

https://www.youtube.com/watch?v=eMruXJUbHNo

Photos by Robb Rosenfeld.

Come look through a telescope under some of the darkest skies in the USA! Join us next week at Great Basin National Park...
09/02/2026

Come look through a telescope under some of the darkest skies in the USA! Join us next week at Great Basin National Park in eastern Nevada for the Great Basin Astronomy Festival, September 10–12.

We'll be joining the National Park Service for three days of stargazing, telescope viewing, science presentations, astrophotography, family activities, and more. We'll even host an Astronomy on Tap in the park!

Caltech scientists will give public talks on galaxies, cosmic fireworks, black holes, and alien worlds, and we'll be operating solar telescopes throughout the day. When you're not looking through a telescope, Great Basin has some spectacular hiking: visit ancient bristlecone pines that have lived for thousands of years, explore Lehman Caves, or climb 13,000-foot Wheeler Peak, the second-highest mountain in Nevada.

The festival is free and open to the public, and there's no entrance fee for Great Basin National Park. We hope to see you there!

https://www.nps.gov/grba/planyourvisit/great-basin-astronomy-festival.htm

What causes gamma-ray bursts, the most powerful explosions in the Universe? We recently hosted Caltech PhD student Delin...
08/28/2026

What causes gamma-ray bursts, the most powerful explosions in the Universe? We recently hosted Caltech PhD student Delina Levine to give a presentation at Astronomy on Tap all about gamma-ray bursts. Her awesome presentation is now up on YouTube:

https://www.youtube.com/watch?v=5rdnPvzpsbk

Photos by Robb Rosenfeld.

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