StarDate

Escapee II


Listen Later

For a star, passing too close to a black hole is never a good thing. If the star doesn’t get eaten, it can get kicked into a high-speed jaunt across the cosmos. And astronomers can track the path of such a star back to its birthplace.

One such high-speed star is plowing through the galaxy at more than a million miles per hour. Today, it appears near the twins of Gemini. But it may have been born halfway across the sky, in Pegasus.

When astronomers traced the star’s path, they found that it intersected with the star cluster Messier 15 about 20 million years ago. The star is the same age as the stars in the cluster, and it has the same composition. That suggests the star was born in M15, then booted out – probably by an encounter with a black hole more than a hundred times the mass of the Sun.

Other astronomers had reported the possibility of such a black hole more than 20 years ago. And the high-speed star appears to confirm it.

Originally, the star would have been a member of a binary. But the two stars passed close to the black hole – closer than Earth is from the Sun. In a complex gravitational dance, the binary was ripped apart. One star was gobbled up by the black hole. But the other one got away – beginning a high-speed dash across the galaxy.

Today, the star is more than 37,000 light-years from the cluster – a possible survivor of a close encounter with a black hole.

Script by Damond Benningfield

...more
View all episodesView all episodes
Download on the App Store

StarDateBy Billy Henry

  • 4.6
  • 4.6
  • 4.6
  • 4.6
  • 4.6

4.6

251 ratings


More shows like StarDate

View all
Radiolab by WNYC Studios

Radiolab

43,812 Listeners

The 365 Days of Astronomy by 365DaysOfAstronomy.org

The 365 Days of Astronomy

352 Listeners

Planetary Radio: Space Exploration, Astronomy and Science by The Planetary Society

Planetary Radio: Space Exploration, Astronomy and Science

1,352 Listeners

SpaceTime with Stuart Gary by Stuart Gary

SpaceTime with Stuart Gary

323 Listeners

BirdNote Daily by BirdNote

BirdNote Daily

1,225 Listeners

Ask a Spaceman! by Paul M. Sutter

Ask a Spaceman!

831 Listeners

Astronomy Cast by Fraser Cain and Dr. Pamela Gay

Astronomy Cast

2,868 Listeners

Universe Today Podcast by Fraser Cain

Universe Today Podcast

559 Listeners

Space Nuts: Astronomy Insights & Cosmic Discoveries by Professor Fred Watson and Andrew Dunkley

Space Nuts: Astronomy Insights & Cosmic Discoveries

231 Listeners

Science Friday by Science Friday and WNYC Studios

Science Friday

6,400 Listeners

Short Wave by NPR

Short Wave

6,539 Listeners

The Supermassive Podcast by The Royal Astronomical Society

The Supermassive Podcast

329 Listeners

NASA's Curious Universe by National Aeronautics and Space Administration (NASA)

NASA's Curious Universe

873 Listeners

Why This Universe? by Dan Hooper, Shalma Wegsman

Why This Universe?

392 Listeners

Crash Course Pods: The Universe by Crash Course Pods, Complexly

Crash Course Pods: The Universe

507 Listeners