Gaia Spots an Enormous Ghost Galaxy Right Next Door that’s Being Dismantled by the Milky Way

From left to right: Large Magellanic Cloud, the Milky Way, and Antlia 2, our next door neighbor and so-called ghost galaxy. Credit: V. Belokurov based on the images by Marcus and Gail Davies and Robert Gendler

Astronomers combing through data from the ESA’s Gaia spacecraft have discovered what they’re calling a ghost galaxy. The galaxy, named Antlia 2 (Ant 2) is an extremely low-density dwarf galaxy that was formed in the early days of the universe. And it is being stripped of its mass by the tidal forces of the Milky Way.
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An Extremely Rare Gamma Ray Emitting Neutron Star Binary Has Been Found

Neutron stars are one of the most fascinating astronomical objects in the known Universe. In addition to being the densest type of star (with the possible exception of quark stars), they have also been known to form binary pairs with massive stars. To date, only 39 such systems have been discovered, and even fewer have been detected that were composed of a massive star and a very high energy (VHE) gamma-ray neutron star.

To date, only two of these systems have been found, the second of which was discovered just a few years ago by a team of international astronomers known as the Very Energetic Radiation Imaging Telescope Array System (VERITAS) collaboration. In addition to being a rare find, the discovery was also very fortunate, since the unusual behavior they observed coming from this system will not be happening again until 2067.

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Direct Observations of a Planet Orbiting a Star 63 Light-Years Away

In the past thirty years, the number of planets discovered beyond our Solar System has grown exponentially. Unfortunately, due to the limitations of our technology, the vast majority of these exoplanets have been discovered by indirect means, often by detecting the transits of planets in front of their stars (the Transit Method) or by the gravitational influence they exert on their star (the Radial Velocity Method).

Very few have been imaged directly, where the planets have been observed in visible light or infrared wavelengths. One such planet is Beta Pictoris b, a young massive exoplanet that was first observed in 2008 by a team from the European Southern Observatory (ESO). Recently, the same team tracked this planet as it orbited its star, resulting in some stunning images and an equally impressive time-lapse video.

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Weekly Space Hangout: Nov 14, 2018: Paul Sutter’s “Your Place in The Universe”

Hosts:
Guest Host Dr. Pamela Gay (astronomycast.com / cosmoquest.org / @starstryder)
Fraser Cain (universetoday.com / @fcain)
Dr. Paul M. Sutter (pmsutter.com / @PaulMattSutter)
Dr. Kimberly Cartier (KimberlyCartier.org / @AstroKimCartier )
Dr. Morgan Rehnberg (MorganRehnberg.com / @MorganRehnberg & ChartYourWorld.org)

Dr. Paul M. Sutter, astrophysicist and science educator – and now AUTHOR – is no stranger to the regular viewers of the WSH – but in case you missed it, and for anyone new to the WSH, Paul earned his Bachelor of Science in Physics from California Polytechnic State University in 2005 and his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011. By day, Paul is a Cosmological Researcher & Community Outreach Coordinator with the Department of Astronomy at Ohio State University.

But Paul is probably best known and loved by everyone here at the WSH as one of our four co-hosts, his weekly show Space Radio, and of course, let’s not forget his podcast Ask a Spaceman!

This week, we turn the tables on Paul (at least briefly!) as he joins us as our special guest to discuss his first book Your Place in the Universe.

You can learn more about Paul and his research by visiting his website, http://www.pmsutter.com.

You can learn where to tune in each week to Space Radio by going to http://www.pmsutter.com/shows/spaceradio/

You can watch episodes of Ask A Spaceman! here: http://www.pmsutter.com/shows/askaspaceman/

And last, but not least, you can learn more about Paul’s book by visiting http://www.pmsutter.com/book.

Announcements:

If you would like to join the Weekly Space Hangout Crew, visit their site here and sign up. They’re a great team who can help you join our online discussions!

If you’d like to join Dr. Paul Sutter and Dr. Pamela Gay on their Cosmic Stories in the SouthWest Tour in August 2019, you can find the information at astrotours.co/southwest.

We record the Weekly Space Hangout every Wednesday at 5:00 pm Pacific / 8:00 pm Eastern. You can watch us live on Universe Today, or the Weekly Space Hangout YouTube page – Please subscribe!

Messier 71 – the NGC 6838 Globular Cluster

Welcome back to Messier Monday! Today, we continue in our tribute to our dear friend, Tammy Plotner, by looking at the unusual globular cluster known as Messier 71.

If you look up into the night sky, on a particularly clear night when there’s not a lot of bright lights nearby, you may be able to make out a series of faint objects. Similar to the Milky Way, that cloudy, ghostly band that reaches across the night sky, these small pockets of fuzzy light are in fact collections of stars located thousands of light years away.

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Astronomy Cast Ep. 505: Seismology

We’re always interested in the surface features of the planets and moons in the Solar System, but that’s only skin deep. It turns out, these worlds have an interesting inner life too. Thanks to the science of seismology, we can peer into our planet and learn how it works… inside. And we’re about to take that technology to Mars.

We usually record Astronomy Cast every Friday at 3:00 pm EST / 12:00 pm PST / 20:00 PM UTC. You can watch us live on AstronomyCast.com, or the AstronomyCast YouTube page.

Visit the Astronomy Cast Page to subscribe to the audio podcast!

If you would like to support Astronomy Cast, please visit our page at Patreon here – https://www.patreon.com/astronomycast. We greatly appreciate your support!

If you would like to join the Weekly Space Hangout Crew, visit their site here and sign up. They’re a great team who can help you join our online discussions!

SpaceX is going to build a mini-BFR to launch on a Falcon 9

In September of 2016, Elon Musk unveiled his vision for a super-heavy launch vehicle, which would be SpaceX’s most ambitious project to date. Known as the Big Falcon Rocket (BFR), this massive launch vehicle is central to Musk’s plan of conducting space tourism with flights into orbit and to the Moon. It is also intrinsic to his vision of sending astronauts and colonists to Mars.

Ever since, the astronomical and aerospace community has been paying close attention to any updates provided by Musk on the BFR’s development. In his latest update, which was made via Twitter, Musk indicated that his company will be building a small, winged version of the massive spaceship component – the Big Falcon Spaceship (BFS) – which will be launch-tested using a Falcon 9 or Falcon Heavy rocket.

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