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Cepheide RS Puppis - Cepheides are very bright variable stars that serve as cosmic beacons...

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PIX4572188
Image title
Cepheide RS Puppis - Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope photographed one of the brightest cepheids, RS Puppis (in the center of the image), located 6500 years - light in the southern constellation of the Puppi. The bright southern hemisphere star RS Puppis, at the center of the image, is swaddled in a gossamer cocoon of reflective dust illuminated by the glittering star. The super star is ten times more massive than our Sun and 200 times larger. RS Puppis rhythmically brightens and dims over a six - week cycle. It is one of the most luminous in the class of so - called Cepheid variable stars. Its average intrinsic brightness is 15,000 times greater than our Sun's luminosity. The nebula flickers in brightness as pulses of light from the Cepheid propagate outwards. By observing the fluctuation of light in RS Puppis itself, as well as recording the faint reflections of light pulses moving across the nebula, astronomers are able to measure these light echoes and pin down a very accurate distance. The distance to RS Puppis has been narrowed down to 6,500 light - years (with a margin of error of only one percent)
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Cepheide RS Puppis - Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope photographed one of the brightest cepheids, RS Puppis (in the center of the image), located 6500 years - light in the southern constellation of the Puppi. The bright southern hemisphere star RS Puppis, at the center of the image, is swaddled in a gossamer cocoon of reflective dust illuminated by the glittering star. The super star is ten times more massive than our Sun and 200 times larger. RS Puppis rhythmically brightens and dims over a six - week cycle. It is one of the most luminous in the class of so - called Cepheid variable stars. Its average intrinsic brightness is 15,000 times greater than our Sun's luminosity. The nebula flickers in brightness as pulses of light from the Cepheid propagate outwards. By observing the fluctuation of light in RS Puppis itself, as well as recording the faint reflections of light pulses moving across the nebula, astronomers are able to measure these light echoes and pin down a very accurate distance. The distance to RS Puppis has been narrowed down to 6,500 light - years (with a margin of error of only one percent)

Photo credit
Photo © NASA/ESA/Novapix / Bridgeman Images
Image keywords
astronomy / star / stern / astronomy / 2013 / hst / star / Novapix / hubble space telescope / astronomy / puppis / Cepheide / cepheid / Star variable / Hubble Constant / Expansion Of The Universe / Constant Hubble / Universe Expansion

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Largest available format 3957 × 3694 px 4 MB
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