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BBC Solar System – Uranus orbits the Sun tilted on its side BBC Solar System – Uranus orbits the Sun tilted on its side Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both are of different chemical composition than the larger gas giants Jupiter and Saturn. For this reason, astronomers sometimes place them in a separate category called "ice giants". Uranus's atmosphere, although similar to Jupiter's and Saturn's in its primary composition of hydrogen and helium, contains more "ices" such as water, ammonia, and methane, along with traces of hydrocarbons. It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of 49 K (−224.2 °C), and has a complex, layered cloud structure, with water thought to make up the lowest clouds, and methane the uppermost layer of clouds.
Sounds of our Solar System (1/2)
Formation Stages
Pluto Pluto Pluto, plus moons: Charon, Nix & Hydra. A recent discovery (July 2011) shows that Pluto has four moons: Charon, Nix, P4, and Hydra. A recent discovery has resulted in Eris being found to be smaller than Pluto[1]. Here is What Wikipedia has to say about Pluto: “Pluto, formal designation is 134340 Pluto. Pluto’s size has been under debate since the discovery of Eris. Pluto is now the largest dwarf planet in the Kuiper Belt (a part of our Solar System) followed by Eris [1].
Is This Proof of Life on Mars? Want to stay on top of all the space news? Follow @universetoday on Twitter View of Mars from Viking 2 lander, September 1976. (NASA/JPL-Caltech) The Curiosity rover is currently on its way to Mars, scheduled to make a dramatic landing within Gale Crater in mid-August and begin its hunt for the geologic signatures of a watery, life-friendly past. Solid evidence that large volumes of water existed on Mars at some point would be a major step forward in the search for life on the Red Planet. Is This Proof of Life on Mars?
Pluto moon discovery hints at future surprises for NASA probe Pluto moon discovery hints at future surprises for NASA probe Skip to next paragraph Subscribe Today to the Monitor Click Here for your FREE 30 DAYS ofThe Christian Science MonitorWeekly Digital Edition The tiny new moon — announced July 20 and called P4 for now — brings the number of known Pluto satellites to four.
Smallest Planet Yields Big Surprises THE WOODLANDS, Texas — Mercury is even weirder than expected, NASA’s MESSENGER probe is showing. Purple marks low elevation and white high elevation in this rendering of ancient volcanic plains in Mercury’s northern hemisphere. Images like these suggest the planet had an active geologic past. NASA, JHUAPL, CIW-DTM, GSFC, MIT, Brown University. Rendering by James Dickson and Jim Head. For starters, the planet’s interior is built differently than anything else scientists have blueprints for. Smallest Planet Yields Big Surprises
More Evidence of Mars’ Watery Past Want to stay on top of all the space news? Follow @universetoday on Twitter The transition between Acidalia Planitia and Tempe Terra from the Mars Express High-Resolution Stereo Camera (HRSC). Credit ESA/DLR/FU Berlin (G. Neukum) ESA’s Mars Express orbiter has sent back images revealing terrain that seems to have been sculpted by flowing water, lending further support to the hypothesis that Mars had liquid water on its surface at some point. More Evidence of Mars’ Watery Past
Asteroids and Comets

Mars's dust bowl image may need a makeover. Dark streaks seen forming in summer and fading in winter might be signs of water flowing just beneath the surface. The sudden appearance of streaks on sloping ground have been attributed to present-day liquid water before, although their origin is still debated. Light streaks have been seen appearing on steep slopes in images taken years apart by NASA's Mars Global Surveyor spacecraft. And seasonal dark streaks have emerged in the north polar region. Liquid water flowing downhill might explain both types of events, but dust or sand avalanches could also be to blame. Dark streaks on Mars bolster case for liquid water - space - 04 August 2011 Dark streaks on Mars bolster case for liquid water - space - 04 August 2011
Dwarf Planets, Pluto Information Dwarf Planets, Pluto Information About Dwarf Planets The world was introduced to dwarf planets in 2006, when petite Pluto was stripped of its planet status and reclassified as a dwarf planet. The International Astronomical Union (IAU) currently recognizes two other dwarf planets, Eris and Ceres. What differentiates a dwarf planet from a planet?
The Neptune's sounds