[Naidheachdan New Tang Dynasty, àm Beijing, 30 Sultain, 2024]Astronomers discover a distant star in the Milky WayEarthThousands of light yearsEarth-like planetsorbiting a star. This Earth-like planet will look like what it will be 8 billion years from nowEarthso people can use this to predict what the earth will be like in 8 billion years.
The University of California, Berkeley, said in a press release issued on September 26 that astronomers from the school saw this planet using the WM Keck Observatory in Hawaii.Earth-like planets.
The rocky planet 4,000 light-years from Earth orbits awhite dwarf(white dwarf), its orbit is about twice that of Earth today, and the mass of the white dwarf is onlysunhalf of
This may be the future fate of Earth.sunIt will eventually expand like a balloon to a size larger than Earth’s orbit today, swallowing up Mercury and Venus in the process. As the sun expands it growsbig red star(red giant), the decrease in mass will cause the planet to move into a more distant orbit, making the chances of Earth living further from the Sun very slim.
big red starThe outer layer eventually drains away, leaving a dense layer behindwhite dwarf. It would be no bigger than a planet, but it would have the same mass as a star. If Earth survives that time, its orbit will probably be twice its current size, further than the current orbit of Mars.
The discovery tells scientists about the evolution of main sequence stars like our sun from red giant to white dwarf, and how this affects the planets around them.
Some studies maintain that, for the Sun, this process would begin in about a billion years, eventually emptying the Earth’s oceans and doubling its orbital radius, but only if the sun does not include the Earth as it expands. The transformation of the sun from a red giant to a white dwarf is estimated to be 8 billion years from now.
Keming Zhang (translated), a former doctoral student at the school who led the study and is currently a postdoctoral researcher at the University of California San Diego, said there is no question that the Earth will destroyed within 6 billion astronomers who have not yet reached a consensus about the eclipse of the sun which became a red giant.
But Zhang Keming said: “In any case, the earth’s residence time is only about 1 billion years, and by that time the earth’s oceans will evaporate due to the effect of a running greenhouse – long before will be swallowed by a great red star.”
Jessica Lu, an associate professor of astronomy at the University of California, Berkeley, said that it is not yet known whether life on Earth could survive the time when the sun became a red giant, but the most important thing is that the Earth did not follow the Sun. he became a red giant, he was consumed.
She said: “The (star) system discovered by Zhang Keming is an example of a planet (probably an Earth-like planet with an initial Earth-like orbit) that survived the red giant phase of its parent star.
Zhang Keming said that even if the earth is swallowed up in the red giant phase of the sun, people can take shelter outside the solar system. Several moons of Jupiter, such as Europa (also known as Europa), Callisto (also known as Callisto), Ganymede (also known as Ganymede), and Saturn’s moon (also known as Enceladus) appear to have icy oceans ). as the sun expands.
Zhang Keming said: “When the sun becomes a red giant, the habitable zone will move close to the orbits of Jupiter and Saturn, and many of these moons will become planets with oceans. I think in this case people may be able to go. get out there.”
The above research results were published in the journal Nature Astronomy on September 26.
(Reprinted from The Epoch Times/Editor: Ye Ping)
URL of this article: https://www.ntdtv.com/b5/2024/09/30/a103917998.html
