Astronomy

Mariner 10's First Close-Up Photo of Venus




On Feb. 5, 1974, NASA's Mariner 10 mission took this first close-up photo of Venus.

Made using an ultraviolet filter in its imaging system, the photo has been color-enhanced to bring out Venus's cloudy atmosphere as the human eye would see it. Venus is perpetually blanketed by a thick veil of clouds high in carbon dioxide and its surface temperature approaches 900 degrees Fahrenheit.

Launched on Nov. 3, 1973 atop an Atlas-Centaur rocket, Mariner 10 flew by Venus in 1974.

Image Credit: NASA

www.nasa.gov/multimedia/imagegallery/image_feature_2443.html#.UvKVYftDIWk

wow


Crescent Moon Rising and Earth's Atmosphere






On Feb. 1, 2014, Japan Aerospace Exploration Agency astronaut Koichi Wakata tweeted this view of a crescent moon rising and the cusp of Earth's atmosphere. Distinct colors are visible because the dominant gases and particles in each layer of the atmosphere act as prisms, filtering out certain colors of light.

> Follow @astro_Wakata on Twitter

Image Credit: NASA


www.nasa.gov/content/crescent-moon-rising-and-earths-atmosphere/#.UvTJps5DIWk

I got a pair of celestron 15x70 binoculars for my birthday last month and I haven't been able to put them down since. I live in an area with relatively bad light pollution but I'm only a few minutes drive from an excellent dark sky site. I was stunned by how much more I could see through the bins. I've also been learning the night sky at every opportunity. I'm a newbie to this, but I really think it's going to catch on!

Astronomers Find The 'Oldest Star In The Universe'




www.huffingtonpost.co.uk/2014/02/10/oldest-star-in-the-universe_n_4758715.html?utm_hp_ref=uk-tech&ir=UK+Tech

These photos are just STUNNING ravenslament

Satellite Shows Major Winter Storm Hitting the U.S. South.

Largest Solar System Moon Detailed in Geologic Map


Animation of a rotating globe of Jupiter's moon Ganymede, with a geologic map superimposed over a global color mosaic. The 37-second animation begins as a global color mosaic image of the moon then quickly fades in the geologic map.
Image Credit: USGS Astrogeology Science Ctr/Wheaton/ASU/NASA/JPL-Caltech

More than 400 years after its discovery by astronomer Galileo Galilei, the largest moon in the solar system – Jupiter's moon Ganymede – has finally claimed a spot on the map.

A group of scientists led by Geoffrey Collins of Wheaton College has produced the first global geologic map of Ganymede, Jupiter’s seventh moon. The map combines the best images obtained during flybys conducted by NASA's Voyager 1 and 2 spacecraft (1979) and Galileo orbiter (1995 to 2003) and is now published by the U. S. Geological Survey as a global map. It technically illustrates the varied geologic character of Ganymede’s surface and is the first global, geologic map of this icy, outer-planet moon.

“This map illustrates the incredible variety of geological features on Ganymede and helps to make order from the apparent chaos of its complex surface,” said Robert Pappalardo of NASA’s Jet Propulsion Laboratory in Pasadena, Calif. “This map is helping planetary scientists to decipher the evolution of this icy world and will aid in upcoming spacecraft observations.”

The European Space Agency's Jupiter Icy Moons Explorer mission is slated to be orbiting Ganymede around 2032. NASA is contributing a U.S.-led instrument and hardware for two European-led instruments for the mission.

Since its discovery in January 1610, Ganymede has been the focus of repeated observation, first by Earth-based telescopes, and later by the flyby missions and spacecraft orbiting Jupiter. These studies depict a complex, icy world whose surface is characterized by the striking contrast between its two major terrain types: the dark, very old, highly cratered regions, and the lighter, somewhat younger (but still very old) regions marked with an extensive array of grooves and ridges.

According to the scientists who have constructed this map, three major geologic periods have been identified for Ganymede that involve the dominance of impact cratering, then tectonic upheaval, followed by a decline in geologic activity. The map, which illustrates surface features, such as furrows, grooves and impact craters, allows scientists to decipher distinct geologic time periods for an object in the outer solar system for the first time.

“The highly detailed, colorful map confirmed a number of outstanding scientific hypotheses regarding Ganymede’s geologic history, and also disproved others,” said Baerbel Lucchitta, scientist emeritus at the U.S. Geological Survey in Flagstaff, Ariz., who has been involved with geologic mapping of Ganymede since 1980. “For example, the more detailed Galileo images showed that cryovolcanism, or the creation of volcanoes that erupt water and ice, is very rare on Ganymede.”

The Ganymede global geologic map will enable researchers to compare the geologic characters of other icy satellite moons, because almost any type of feature that is found on other icy satellites has a similar feature somewhere on Ganymede.

“The surface of Ganymede is more than half as large as all the land area on Earth, so there is a wide diversity of locations to choose from,” Collins said. “Ganymede also shows features that are ancient alongside much more recently formed features, adding historical diversity in addition to geographic diversity.”

Amateur astronomers can observe Ganymede (with binoculars) in the evening sky this month, as Jupiter is in opposition and easily visible.

The project was funded by NASA through its Outer Planets Research and Planetary Geology and Geophysics Programs. NASA's Jet Propulsion Laboratory is managed by the California Institute of Technology, Pasadena.

www.nasa.gov/jpl/news/ganymede20140212/index.html#.Uv0Drc5DIWk