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VY Canis Majoris ( VY CMa ) is a red hypergiant in the constellation Canis Major . It is one of the largest known stars by radius and also one of the most luminous of its type . It is approximately 1,420 ± 120 solar radii [ 8 ] (6.6 astronomical units ), about 1,975,000,000 kilometres (1.227 × 10 9 mi) in diameter, and about 1.2 kiloparsecs (3,900 light-years) distant from Earth.
Maven Nasa Mission
This year's second total lunar eclipse on Saturday (Dec. 10) will offer a rare chance to see a strange celestial sight traditionally thought impossible. Ringside seats for the lunar eclipse can be found in Alaska, Hawaii, northwestern Canada, Australia, New Zealand, and central and eastern Asia. Over the contiguous United States and Canada, the eastern zones will see either only the initial penumbral stages before moonset, or nothing at all.
23 November 2011 Last updated at 18:59 GMT Saturn's moon Titan bears many similarities to the early Earth Scientists have outlined which moons and planets are most likely to harbour extra-terrestrial life.
The Visible Infrared Imager Radiometer Suite, or VIIRS, onboard NASA's newest Earth-observing satellite acquired its first image this week, a stunning view of Eastern North America from Canada's Hudson Bay past Florida to the northern coast of Venezuela. The low-Earth orbit satellite known as NPP carries five instruments as it travels at 16,640mph at an altitude of 512 miles. It was launched October 29 from Vandenberg Air Force base in California on a mission to observe Earth's environment and climate. NASA says the tools aboard the NPP will be used in monitoring that planet's environment, exposing long-term patterns helpful in assessing the impact of climate change as well as providing data that will be used by meteorologists for weather forecasting. VIIRS will collect radiometric imagery in visible and infrared wavelengths of the Earth's land, atmosphere, and oceans.
Astronomers have discovered a strange population of tiny, distant galaxies forming stars at a surprisingly rapid clip. The researchers used the Hubble Space Telescope to spot the 69 hyperactive dwarf galaxies, which are about 9 billion light-years away from Earth. They're churning out stars so fast that their stellar population would double in just 10 million years. By contrast, it took the Milky Way 1,000 times longer to double its number of stars, researchers said. The new results are unexpected, since they're somewhat at odds with other recent studies of ancient dwarf galaxies.