Uranus is the only giant planet whose equator is nearly at right angles to its orbit. A collision with an Earth-sized object may explain Uranus’ unique tilt. Nearly a twin in size to Neptune, Uranus has more methane in its mainly hydrogen and helium atmosphere than Jupiter or Saturn. Methane gives Uranus its blue tint.
Featured Mission: Voyager 2 Most of what we know about Uranus came from Voyager 2’s flyby in 1986. The spacecraft discovered 10 additional moons and several rings before heading on to Neptune.
One of HST’s most cited set of observations was the series of images taken in July 1994 as the dishevelled remnants of Comet Shoemaker-Levy 9 crashed into Jupiter. That event highlighted the catastrophic consequences of cosmic impacts, and sparked considerable interest in identifying earth-crossing asteroids and comets. Fifteen years later, on 19 July 2009, an Australian amateur astronomer, Anthony Wesley, noticed a strange dark ‘scar” near Jupiter’s southern pole. The feature was quickly confirmed by other astronomers, both amateur and professional, and was quickly judged as likely to be the result of another, completely unexpected, cometary impact. The SL9 impact was thought to be a once-in-a-lifetime (if not more) event; clearly, the impact rate is higher than previously suspected. At the time of the new event, HST was deeply immersed in the initial on-orbit instrument performance tests, but the science staff were able to interrupt those procedures for a few orbits to obtain images with Wide-Field Camera 3. Further observations will be obtained at a later date to track the evolution of the feature, as Jovian winds disperse the detritus through the atmosphere.
The movie on the left is a time-interpolated, evenly spaced sequence of frames showing motions in Jupiter’s atmosphere over the course of 5 days, from October 1 to October 5, 2000. The smallest features are about 500 km across.
The movie on the right is made from narrow angle blue filter images taken during 7 separate Jupiter rotations between October 1 and October 5, 2000, shows the counterclockwise atmospheric motions around the Great Red Spot. The smallest features are about 500 km across.
Credit: NASA/JPL/University of Arizona, Cosmos Studios Released: November 20, 2000
Signs of Water Found on 5 Alien Planets by Hubble Telescope
NASA’s Hubble Space Telescope has detected water in the atmospheres of five planets beyond our solar system, two recent studies reveal.
The five exoplanets with hints of water are all scorching-hot, Jupiter-size worlds that are unlikely to host life as we know it. But finding water in their atmospheres still marks a step forward in the search for distant planets that may be capable of supporting alien life, researchers said.
Gorgeous telescope timelapse makes you feel like you’re standing in Chile
As the chill of winter settles into the northern hemisphere, fantasies of down-south travel pervade a lot of people’s dreams. Well, here’s a virtual journey to warm climes for astronomy buffs: a beautiful, music-filled timelapse of several European Southern Observatory telescopes gazing at the heavens in Chile.
Uploaded in 2011 (but promoted this morning on ESO’s Twitter feed), the timelapse was taken by astrophotographers Stéphane Guisard (also an ESO engineer) and José Francisco Salgado (who is also an astronomer at Chicago’s Adler Planetarium.)
Saturn’s hexagon is a persisting six sided cloud pattern around the north pole of the planet. It is created by a band of upper-atmospheric winds, and the sides of it are about 13,800 km (8,600 mi) long, which is longer than the Earth’s diameter. There’s a hurricane swirling within the hexagon.
An animation of the hexagonal storm present on Saturn’s north pole. The hexagon is 30,000 kilometers across and has constant winds of more than 300 kilometers per hour. Images acquired by the Cassini spacecraft on December 10th, 2012.