Our Sun's days are numbered. In about 5 billion years the Sun will expand into a red giant, casting off its outer layers before settling down to become a white dwarf.
, there are still a few things we have to learn about dying suns.This recent study looks at a star known as V Hydrae or V Hya for short. It's a red giant star about 1,300 light-years away with a mass roughly the same as the Sun. It's what the Sun might look like in a few billion years.For one, it has a companion star. The companion is too faint for us to see, but based on the motion of V Hya, we know it is likely a red dwarf star that orbits V Hya once every 8.5 years.
These two characteristics combined make V Hya an Asymptomatic Giant Branch star or AGB. About 90 percent of sunlike stars will enter an AGB period toward the end of their life.Astronomers have generally thought that the AGB epoch is a gradual process of stellar death, where the outer layers of the star are cast off over a period of about 100,000 years. After which, the remaining core collapses into a white dwarf. But V Hya shows this is either partly or sometimes incorrect.
But observations by the Atacama Large Millimeter/submillimeter Array show that V Hydrae isn't creating such a nebula.
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