1. casyopeia: Drew some galaxies and nebulae with chalk. :) Not exactly accurate, but I’m proud of myself. I’m an astrophysicist, not an artist! xP

    casyopeia:

    Drew some galaxies and nebulae with chalk. :) Not exactly accurate, but I’m proud of myself.

    I’m an astrophysicist, not an artist! xP

  2. ikenbot: Saturn’s Icy Moon Dione Has Oxygen Atmosphere A NASA spacecraft circling Saturn has discovered a wispy oxygen atmosphere on the ringed planet’s icy moon Dione, but you wouldn’t want to live there. For one thing, you wouldn’t be able to breathe — Dione’s atmosphere is 5 trillion times less dense than the air at Earth’s surface, scientists say. Dione’s atmosphere was detected by NASA’s Cassini spacecraft, which spotted an ultra-thin layer of oxygen ions so sparse that it is equivalent to conditions 300 miles (480 kilometers) above Earth. On Dione, there is one oxygen ion for every 2,550 cubic feet (90,000 cubic meters), but it’s still enough to qualify as an atmosphere, Cassini mission scientists announced Friday (March 2). “We now know that Dione, in addition to Saturn’s rings and the moon Rhea, is a source of oxygen molecules,” Cassini team member Robert Tokar of the Los Alamos National Laboratory in New Mexico, who led the new study, said in a statement. “This shows that molecular oxygen is actually common in the Saturn system and reinforces that it can come from a process that doesn’t involve life.” Dione is one of Saturn’s smaller moons and is about 698 miles (1,123 km) wide. It orbits Saturn once every 2.7 days at a distance of about 234,000 miles (377,400 km) — roughly the same as that between Earth and its moon, according to a NASA description.

    ikenbot:

    Saturn’s Icy Moon Dione Has Oxygen Atmosphere

    A NASA spacecraft circling Saturn has discovered a wispy oxygen atmosphere on the ringed planet’s icy moon Dione, but you wouldn’t want to live there. For one thing, you wouldn’t be able to breathe — Dione’s atmosphere is 5 trillion times less dense than the air at Earth’s surface, scientists say.

    Dione’s atmosphere was detected by NASA’s Cassini spacecraft, which spotted an ultra-thin layer of oxygen ions so sparse that it is equivalent to conditions 300 miles (480 kilometers) above Earth. On Dione, there is one oxygen ion for every 2,550 cubic feet (90,000 cubic meters), but it’s still enough to qualify as an atmosphere, Cassini mission scientists announced Friday (March 2).

    “We now know that Dione, in addition to Saturn’s rings and the moon Rhea, is a source of oxygen molecules,” Cassini team member Robert Tokar of the Los Alamos National Laboratory in New Mexico, who led the new study, said in a statement. “This shows that molecular oxygen is actually common in the Saturn system and reinforces that it can come from a process that doesn’t involve life.”

    Dione is one of Saturn’s smaller moons and is about 698 miles (1,123 km) wide. It orbits Saturn once every 2.7 days at a distance of about 234,000 miles (377,400 km) — roughly the same as that between Earth and its moon, according to a NASA description.

  3. the-star-stuff:

    Strange Places on Mars

    #1. The image above shows a dune field on the floor of a crater made by an asteroid impact.

    #2. This image of layered deposits on a plateau in the Valles Marineris region of Mars was taken in 2007 by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter. The image shows about three-fourths of a mile across. Scientists think the layers contain opaline silica and iron sulfates formed through alteration by acidic water.

    #3. This image is of the carbon dioxide ice cap at the south pole of Mars. The pattern is formed by the ice vaporizing. Scientists think that as the ice cap melts from the bottom up, the carbon dioxide turns directly into gas. It flows beneath the ice to openings, eroding the ground below into a spiderlike network of troughs. The flowing gas also carries dust that escapes with it and settles into fan-shaped deposits on top of the ice.

    #4. The stripes in this image are linear dunes on the floor of a crater in the Noachis Terra region of Mars. The dark areas are the dunes, and the lighter boulder-strewn lines are between the dunes. This image was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter on Dec. 28, 2009.

    #5. This image looks remarkably like groves of trees growing among Martian dunes. But, the trees are an optical illusion. They are actually dark streaks of sediment on the downwind side of the dunes. They were created by escaping gas from the evaporating carbon dioxide ice below. The bottom of the ice melts into vapor and moves toward holes in the ice, carrying dark sediment along with it that is then deposited when the gas escapes.

    #6. Scientists have found evidence of iron-bearing sulfates and clay minerals in the exposed areas of this region of the Noctis Labyrinthus formation. A dune field covers some of the ground.

    #7. This false-color image looks like it could be of the desert southwest in North America. These gully channels running from a cliff area near the crater rim show typical shapes made by water-carved streams on Earth. The image was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter.

    #8. This image shows an area within Proctor Crater that has both dunes and ripples. The smaller, brighter ridges are ripples made of very fine sand. The larger, darker forms are dunes made of dust from dark volcanic rocks. This image was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter in February 2009. 

    Images: NASA/JPL-Caltech/University of Arizona

  4. ikenbot: North America Nebula Burns Bright in Skywatcher Photo The gas and dust of the North America Nebula glow pink and red in this skywatcher photo. The North America Nebula lies in the constellation Cygnus, and it takes its name from a supposed resemblence to the continent. It is an emission nebula — essentially, a cloud of high-temperature gas emitting light of various colors. The image was taken by Jean-Luc Dauvergne in August 2007 from the observatory at the Pic du Midi mountain in the French Pyrenees. The skyscape in the image glowing most brightly is the most active part of the nebula, a region astronomers call the Cygnus Wall. Here, hydrogen gas burns where new stars are forming. The North America Nebula, also known as NGC 7000, is roughly 1,800 light-years away and perhaps 100 light-years in diameter. A light-year is the distance light travels in one year, or about 6 trillion miles (10 trillion kilometers).

    ikenbot:

    North America Nebula Burns Bright in Skywatcher Photo

    The gas and dust of the North America Nebula glow pink and red in this skywatcher photo.

    The North America Nebula lies in the constellation Cygnus, and it takes its name from a supposed resemblence to the continent. It is an emission nebula — essentially, a cloud of high-temperature gas emitting light of various colors.

    The image was taken by Jean-Luc Dauvergne in August 2007 from the observatory at the Pic du Midi mountain in the French Pyrenees. The skyscape in the image glowing most brightly is the most active part of the nebula, a region astronomers call the Cygnus Wall. Here, hydrogen gas burns where new stars are forming.

    The North America Nebula, also known as NGC 7000, is roughly 1,800 light-years away and perhaps 100 light-years in diameter. A light-year is the distance light travels in one year, or about 6 trillion miles (10 trillion kilometers).




















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