Posts Tagged ‘lyra’
Starry Raven
Credit: NASA and The Hubble Heritage Team (STScI/AURA)
Looking like a large bird’s head, galaxies collide in this image of NGC 6745 from NASA’s Hubble Space Telescope.
Ring around the eye
Credit: The Hubble Heritage Team (AURA/STScI/NASA)
One of the most famous of all planetary nebula, the Ring Nebula (M57) glows in our summer skies. This “eye in the sky” is the remains of another sun-like star. The central star has blown off layers of gas and dust to form a bubble in space. Clumps of dark material can be seen near the edges while the dying central star can be seen floating in the bluish hot gas. The image is close to the actual color of the nebula. The blue area represents hot gas while areas farther out become cooler and redder. This shows how the gas in the bubble glows because of ultraviolet radiation from the doomed central star. The surface temperature of the star is a whopping 216,000 degrees Fahrenheit (120,000 Celsius). Our Sun’s surface temperature is about 11,000 degrees Fahrenheit (6,000 Celsius).
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The ancient peoples saw pictures in the sky. From those patterns in the heavens, ancient storytellers created legends about heroes, maidens, dragons, bears, centaurs, dogs and mythical creatures…Read More
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