Astronomers have found evidence for a dying Sun-like star coming briefly back to life after casting its gassy shells out into space, mimicking the possible fate our own Solar System faces in a few billion years.
This new picture of the planetary nebula Abell 30, located 5500 light-years from Earth, is a composite of visible images from the NASA/ESA Hubble Space Telescope and X-ray data from ESA's XMM-Newton and NASA's Chandra space telescopes.
'Planetary nebula' is the name given to the often-concentric shells of stellar material cast into space by dying stars. To astronomers of the 18th century, these objects looked like the colourful 'blob' of a planet through their telescopes, and the name stuck.
Astronomers now know that as a star with less than eight times the mass of the Sun swells into a red giant towards the end of its life, its outer layers are expelled via pulsations and winds.
Ultraviolet radiation shining out from the stripped-down hot stellar core then lights up the ejected shells, resulting in intricate artworks that can be seen by modern telescopes.
The star at the heart of Abell 30 experienced its first brush with death
12 500 years ago – as seen from Earth – when its outer shell was stripped off by a slow and dense stellar wind.
Optical telescopes see the remnant of this evolutionary stage as a large, near-spherical shell of glowing material expanding out into space.
Then, about 850 years ago, the star suddenly came back to life, coughing out knots of helium and carbon-rich material in a violent event.
The star's outer envelope briefly expanded during this born-again episode, but then very rapidly contracted again witin 20 years.
This had the knock-on effect of accelerating the wind from the star to its present speed of 4000 kilometres per second – over 14 million kilometres per hour.
As this fast stellar wind catches up and interacts with the slower wind and clumps of previously ejected material, complex structures are formed, including the delicate comet-like tails seen near the central star in this image.
The stellar wind bombarding dense clumps of material provides a chilling look at the possible fate of Earth and its fellow planets in our own Solar System in a few billion years' time.
When our Sun emits its final gasps of life at the heart of a planetary nebula, its strong stellar wind and harsh radiation will blast and evaporate any planets that may have survived the red giant phase of stellar evolution.
If any distant civilisation is watching with high-power telescopes at the time, they might see the glowing embers of the planets light up in X-rays as they are engulfed in the stellar wind.
European Space Agency: http://www.esa.int
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
New research from NASA shows that the Arctic Ocean has been steadily getting more energy from the sun over the past fifteen years.
Nasa's Orbiting Carbon Observatory produces its first global maps of carbon dioxide in Earth's atmosphere.
Plumes of water from Jupiter's moon Europa have not reappeared since their discovery – and evidence now suggests they may not have existed to begin with
The Kepler space telescope, which cost some $600 million, was feared to be at the end of its useful life in 2013. But NASA says it just found another exoplanet.
An asteroid-mining company has unveiled plans for a new mothership spacecraft designed to carry a dozen small probes to explore asteroids, comets, or even the moon. The mothership, designed by Deep Space Industries, is about 3 feet in diameter and 1.5 feet tall, weighing about 330 pounds.
The creeping movement of the ground in California's Napa Valley, following its August earthquake, has been observed from space.
We can now grow plants in microgravity – and crops grown in asteroid soil could sustain vast human populations off-planet
After space station resupply launch, engineers will try to land part of a SpaceX rocket on an offshore barge for possible reuse
Cities are brighter during the holidays than any other time in the year
Streams of shooting stars delighted stargazers around the world over the weekend as the Geminids meteor shower hit its peak