@nasa : Showcased at the center of this Hubble Space Telescope image is an emission-line star. Located just under 2,300 light-years from Earth, this star displays prominent emission lines, meaning that the star’s light, dispersed into a spectrum, shows up as a rainbow of colors marked with a characteristic pattern of dark and bright lines. The characteristics of these lines, when compared to the “fingerprints” left by particular atoms and molecules, can be used to reveal the star’s chemical composition. Under 10 million years old and not yet burning hydrogen at its core, unlike the sun, this star is still in its infancy. Further evidence of the star's youth is provided by the presence of reflection nebulae. These hazy clouds, pictured floating above and below, are created when light from a star reflects off a high concentration of nearby dust, such as the dusty material still remaining from the star’s formation. Image credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt #nasa #space #esa #hubble #hst #astronomy #science
โพสต์เมื่อ 7 มี.ค. 2559 | 00:46 น.
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