Astronomers have found one of the best exomoon candidates based on data collected by the Kepler spacecraft. Now they just need the Hubble observations to check if it exists.
This image from the Cassini spacecraft shows four of Saturn’s moons and the outskirts of the planet’s rings. Saturn’s largest moon, Titan, is in the background. In front of it and above the rings at center is Dione, one of the mid-size moons. The small moon Pandora orbits beyond the rings on the right of the image. Finally, Pan peeks out as a spot in the Encke Gap of the A ring on the left of the image. Credit:NASA / JPL-Caltech / Space Science Institute
Astronomers have found thousands of exoplanets orbiting their host stars. Yet, despite thousands of observations, one type of detection has proven elusive: the signal of an exomoon.
Check out my article at Sky & Telescope detailing the latest news from the Cool Worlds Lab at Columbia University.
My latest article is up at Sky & Telescope. I discuss two recent studies suggest that brown dwarfs, or so-called “failed stars,” are nevertheless more like stars than planets.
Artist Conception of a Brown Dwarf Atmosphere / NASA JPL
Brown dwarfs are the exceedingly common runts of the stellar litter. But even though they’re everywhere, their faint glow makes them difficult to observe and understand. Two recent studies shed light on the formation of these once-exotic objects.
First proposed as an idea in the 1960s and finally discovered in the 1990s, brown dwarfs bridge the gap between the smallest stars and the largest planets, never igniting hydrogen fusion in their cores. They cool off over time, slowly shedding the nascent heat leftover from their formation as a dim glow.
Read more here!
So much of our night sky has yet to be mapped by large, deep surveys. A recent paper highlights the importance of ongoing work, as astronomers have just identified a new companion galaxy to our Milky Way. Named “Crater 2” this galaxy is the fourth largest discovered around our Galaxy, and is quite distant, nearly 400,000 light years away. You can read more about Crater 2 and my take on it over at Sky and Telescope.
From my latest at Sky & Telescope:
Recent radio observations support the idea that brown dwarfs form like full-fledged stars do.
Brown dwarfs, which bridge the gap between stars and planets, have been an exciting target for astronomers since their discovery in the mid-1990s. Since that time, we’ve observed and classified hundreds of these objects, but the details of how they form still remain an active area of research. The answer to a simple question, “Do brown dwarfs form in a method similar to stars, or do they form more like planets?” has eluded astronomers for decades.
– See more at: Sky & Telescope
The variety of exoplanets that have been discovered in the last 20 years is astounding. In this Sky & Telescope article, I discuss the discovery of Gliese 436b, a planet with a comet tail!
One of the wonderful programs run by NASA is the Lunar and Meteorite Disk Program, which allows educators the opportunity to borrow samples of moon rocks collected by Apollo astronauts, along with some meteorites recovered all over the globe. I used the moon rocks as part of my introductory Astronomy class here at Rider, and gave my students a chance to examine pieces of other worlds. Adam Grybowski put together a nice article for the News@Rider detailing our class.
I got the chance to speak at Google over the winter break as part of the Talks at Google series. If you are interested in hearing the talk, its now on YouTube (and embedded below). The entire trip to Mountain View was a great time, and the audience for my talk was engaging and had great questions. Astronomy is entering an exciting era, where surveys such as Gaia and LSST will provide the precise data needed to answer some of our biggest questions, including characterizing dark energy and producing exquisite maps of the Milky Way. Moreover, all of the data will be public, meaning anyone with an internet connection can get their hands on cutting edge data. The opportunities for citizen science will be outstanding. Hope you enjoy the talk!