Snapshot of the Star that Changed the Universe : 無料・フリー素材/写真
Snapshot of the Star that Changed the Universe / NASA Goddard Photo and Video
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | NASA image release May 23, 2011To view a video related to this image go here: www.flickr.com/photos/gsfc/5751335447/in/photostreamViews of a famous pulsating star taken nearly 90 years apart and a portrait of its galactic home are shown in this image collection.The pancake-shaped disk of stars, gas, and dust that make up the Andromeda galaxy, or M31, is shown in the image at left. Andromeda is a Milky Way neighbor and resides 2 million light-years away.The tiny white box just above center outlines the Hubble Space Telescope view. An arrow points to the Hubble image, taken by the Wide Field Camera 3. The snapshot is blanketed with stars, which look like grains of sand.The white circle at lower left identifies Hubble variable number one, or V1, the Cepheid variable star discovered by astronomer Edwin Hubble in 1923. Cepheid variables are pulsating stars that brighten and fade in a predictable pattern. Astronomers use them to calculate how far away they are from Earth.The large white box outlines the region imaged by astronomer Edwin Hubble, who used the 100-inch Hooker telescope, the most powerful telescope of that era. An arrow points to a copy of Hubble's image of Andromeda, which was made on a 4-inch-by-5-inch glass plate and dated Oct. 6, 1923.Edwin Hubble originally identified three novae, a class of exploding star, by writing "N" next to each object. Later, Hubble realized that the nova at top right was actually a Cepheid variable. He crossed out the "N" and wrote "VAR," for variable. This star allowed Hubble to calculate a reliable distance to Andromeda, proving that it was a separate galaxy outside our Milky Way.To read more go to: www.nasa.gov/mission_pages/hubble/science/star-v1.htmlObject Name: M31Image Type: Astronomical/IllustrationIllustration Credit: NASA, ESA, and Z. Levay (STScI)Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.Follow us on TwitterJoin us on Facebook |
| 撮影日 | 2011-05-18 15:19:43 |
| 撮影者 | NASA Goddard Photo and Video , Greenbelt, MD, USA |
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