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Our journalists and guest bloggers bring you stunning imagery and the space stories that matter most.

Let’s be careful about this “SETI” signal

Franck Marchis • August 30, 2016 • 10

Several readers have contacted me recently about reports that a group of international astronomers have detected a strong signal coming from a distant star that could be a sign of a high-technology civilization. Here’s my reaction: it’s interesting, but it’s definitely not the sign of an alien civilization—at least not yet.

Back on the Rails with OSETI

Bruce Betts • August 28, 2014

The Planetary Society sponsored all-sky optical SETI search at Harvard University went off the rails, telescope roof rails that is, but it is back on track and hunting the sky for ET.

Intro Astronomy 2014. Class 13: Galaxies, the Universe, Life

Bruce Betts • May 08, 2014 • 1

Discover the Universe including the Big Bang, dark matter, dark energy, galaxies, life and more in this video of class 13 of Bruce Betts' Introduction to Planetary Science and Astronomy class.

Cosmos with Cosmos Episode 12: Encyclopedia Galactica

Casey Dreier • February 05, 2014 • 8

Cosmos returns in fine form in its penultimate episode. Sagan explores the historical and scientific precedents for the search for extraterrestrial life (SETI) and our human desires to not be alone in the universe.

Planetary Radio: Looking for Intelligence in a Flash

Mat Kaplan • November 05, 2013 • 1

An update on the Planetary Society's improved Optical SETI search, with Harvard's Paul Horowitz and Curtis Mead.

Cosmos with Cosmos Episode 2: One Voice in the Cosmic Fugue

Casey Dreier • October 21, 2013 • 16

In episode 2 we switch from cosmos to microcosm and discover how we are connected to all living things. Is Sagan too authoritative in this episode? Plus, a major error in one of the stories.

Your Name...On Its Way to the Stars?

Mat Kaplan • October 08, 2013

This week's Planetary Radio features artist Jon Lomberg inviting listeners to join the New Horizons Message Initiative.

Our Improved Optical Search for ET

Bruce Betts • October 08, 2013

The Planetary Society Optical SETI (OSETI) Telescope was successfully upgraded and fully tested, and is now fully operational looking for aliens. Here are some updates on the performance and progress. In summary, the upgraded telescope is performing just as hoped and is scanning the skies.

Optical SETI Gets a Major Upgrade

Bruce Betts • August 30, 2012 • 5

The Planetary Society Optical SETI Telescope in Harvard, Massachusetts just got a major upgrade of its electronics.

One Man's Quest for SETI's Most Promising Signal

Amir Alexander • January 27, 2012 • 2

A review of Robert H. Gray's "The Elusive Wow: Searching for Extraterrestrial Intelligence."

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