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People have witnessed supernovae for millennia, but what threat do they pose to life on Earth? This video is sponsored by Brilliant. You can get started for ...
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Oct 31, 2019 · What happens when a star explodes? Surprisingly, the same thing that happens when gas explodes here on Earth. For explosions to occur, there needs to be a build-up of pressure.
Feb 19, 2014 · The NuSTAR map of Cas A shows the titanium concentrated in clumps at the remnant’s center and points to a possible solution to the mystery of how the star met its demise. When researchers simulate supernova blasts with computers, as a massive star dies and collapses, the main shock wave often stalls out and the star fails to shatter.
Dec 13, 2017 · NASA's Chandra X-Ray Observatory has been taking a long, hard look at one of the Milky Way's most famous and studied objects - the remnant of an exploded star, Cassiopeia A. And it's revealed the location of the elements left behind in the star's remains. By isolating the X-rays produced by the elements silicon, sulphur, calcium and iron, as ...
- What’s A Safe Distance from A Supernova?
- What Would Happen If A Supernova Exploded Near Earth?
- Close Supernovas in The Not-So-Distant Past
- A New, Close Supernova in M101
- How Far Away Are The Closest Supernova Candidates?
- What About Betelgeuse?
- How Often Do Supernovas Erupt in Our Galaxy?
A supernova is a spectacular explosion of a massive star. If our sun exploded as a supernova, the resulting shock wave probably wouldn’t incinerate the entire Earth, but the side of Earth facing the sun would boil away. Scientists estimate that the planet as a whole would increase in temperature to roughly 15 times hotter than our sun’s normal surf...
Let’s consider the explosion of a star that’s at an unsafe distance to Earth. Say, the supernova is 30 light-years away. Mark Reid, a senior astronomer at the Harvard-Smithsonian Center for Astrophysics, said: What’s more, if a supernova exploded within 30 light-years, phytoplankton and reef communities would be particularly affected. Such an event...
No supernova has been known to erupt within 100’s of light-years in the known history of humankind. The most recent supernova visible to the eye was Supernova 1987A, in the year 1987. It was approximately 168,000 light-years away. Before that, the last supernova visible to the eye was was documented by Johannes Kepler in 1604. At about 20,000 light...
A new supernova in the Pinwheel Galaxy, aka M101, is the closest to Earth in a decade. However, at 21 million light-years, it won’t impact us on Earth. Amateur astronomer Koichi Itagaki discovered it on May 19, 2023. The supernova brightened for a few days. It should remain visible to amateur astronomers with backyard telescopes for a few months. T...
First, there are two different kinds of supernovas. A Type IIsupernova is an aging massive star that collapses. There are no stars massive enough to do this located within 160 light-years of Earth. A Type I supernova happens when a small, faint white dwarf star collapses due to infalling material of a companion. These stars are dim and hard to find...
One star that comes up whenever the subject turns to supernovas is Betelgeuse, one of the brightest stars in our sky, part of the famous constellation Orion. Betelgeuse is a supergiant star. It is intrinsically very brilliant. Such brilliance comes at a price, however. Betelgeuse is one of the most famous stars in the sky because it’s due to explod...
No one knows. Scientists have speculated that the high-energy radiation from supernovas has already caused mutations in earthly species, maybe even human beings. One estimate suggests there might be one dangerous supernova event in Earth’s vicinity every 15 million years. Another says that, on average, a supernova explosion occurs within 10 parsecs...
Mar 7, 2019 · By Brian C. Thomas. A massive star that exploded near Earth about 2.5 million years ago—a supernova—may have helped drive the megalodon to extinction and may even have affected human evolution. Research by an international team of scientists and I have produced the most detailed picture ever of just how such a scenario played out.
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In 1987, Earth's sky was lit up by a rare spectacle. The explosion of light from a dying star going supernova in the Large Magellanic Cloud first became visible in February. Just 168,000 light-years away, the event was so bright it could be seen from the surface of our planet with the naked eye – a pinprick of light that brightened, then ...
