Many different kinds of exoplanets have been found by astronomers, from giant “hot Jupiters” and “super Earths” to smaller rocky worlds like Earth or Mars. Now, another type has been discovered, an “ice giant” similar to Uranus or Neptune in our own Solar System. The planet is about 25,000 light-years away in the constellation Sagittarius and is one of the first found that appears to be similar to the ice giant planets in our Solar System, Uranus and Neptune, which are part gas and part ice in composition. The discovery was made by an international team of astronomers, led by Radek Poleski, a postdoctoral researcher at Ohio State University.
Category Archives: Exoplanets
Being able to find exoplanets orbiting distant stars is a major accomplishment in itself, and fine-tuning the data enough to discover details about the characteristics of those planets is quite another. Not an easy task. Astronomers have had some initial success, but now they have been able to create the most detailed weather map for any exoplanet so far.
Solar systems, including ours, are thought to begin as massive clouds of dust and gas surrounding young stars; over billions of years, planets form from repeated impacts of rocky debris. Asteroids and comets are left-over chunks of debris from that process which didn’t coalesce together. Such debris clouds, or protoplanetary disks, have been found around many young stars. These are solar systems still in their infancy. Now, astronomers have been able to observe the actual collision between two large rocky bodies, most likely asteroids, in a protoplanetary disk surrounding a young, Sun-like star 1,200 light-years away.
Astronomers have discovered the oldest known (so far) exoplanet which might be capable of supporting life; the planet, Kapteyn b, is likely more than twice the age of the Earth. The planet was found by an international team of astronomers, led by Guillem Anglada-Escude from Queen Mary University.
Astronomers on Monday made a “big” announcement about exoplanets, and it is big – literally. Another new world has been discovered, which is quite routine now these days, but this one is different, and unexpected; a planet which is more than twice as large as Earth and about 17 times heavier, a sort of “mega-Earth” as some have referred to it. Nothing else like it has been seen before, until now. The new discovery was announced at a press conference during a meeting of the American Astronomical Society (AAS).
Saturn’s moon Titan is one of the murkiest places in the Solar System; its thick smog-like hydrocarbon haze in the upper atmosphere shrouds the entire moon, much like Venus’ perpetual cloud cover. Titan’s surface is completely hidden by this orange-ish haze, making it look rather bland and uninteresting. This unique environment may provide valuable clues to the nature of atmospheres on distant exoplanets, however, according to new findings from scientists with the Cassini mission.
There is some good news for planet-hunters this week: The proposed K2 mission extension for the Kepler Space Telescope has been been approved by NASA. The approval, based on a recommendation from the agency’s 2014 Senior Review, means that the Kepler mission will have at least two more years to continue its search for exoplanets, after having already found thousands of planetary candidates and nearly a thousand confirmed planets to date.
Exoplanets orbiting distant stars are now being discovered in the thousands, with a new discovery made almost every week now. But what about exomoons? In our own solar system, moons far outnumber planets, so it should be considered likely that many of those other planets out there would also have moons. The problem is size; moons tend to be much smaller than planets in most cases, so detecting them orbiting such far away worlds is very difficult. Thankfully, however, technology is now at the point where just such detections should begin to be possible. A new technique how now been proposed that could allow astronomers to bring exomoons from theoretical concepts to reality.