When the Sun becomes a red giant and scorches Earth, our solar system’s habitable zone will move out to the region around Pluto. Skip to content Introducing the all-new Astronomy.com Forum!

As the Sun swells into a red giant, its outer layers become more tenuously held, and will get blown off, out of the Solar System entirely, causing the Sun to lose mass.

This reaction will push the outer layers of the sun away, causing the sun to expand into a red giant. This won’t happen for a long time, though. The sun has enough hydrogen in its core to last ...

The expanding sun will engulf the Earth just before it reaches the tip of the red giant phase, and the sun would still have another 0.25 AU and 500,000 years to grow.

The layers outside the solar core will expand and, as a result, cool down. ... The red giant phase ends when the Sun’s core gets hot enough (about 100 million kelvins) ...

As the sun sheds its outer layers, its mass will decrease, ... From red giant to white dwarf. Once the sun has emptied its fuel reserves, it will become unstable and start to pulse.

In the final stage of the Red Giant expansion, the Earth will be pulled into a 200-year decreasing spiral orbit, which will destroy the planet as it descended through the layers of the red giant sun.

First, the bad news: In a little under 8 billion years, the expanding red-giant-Sun will engulf the Earth. Things gets worse from there, as you can imagine. Not that it was great to start with ...

In about 5 billion years, our sun will become a red giant, puffing up and expanding as it releases layers of material and likely evaporating the solar system’s inner planets, although Earth’s ...

In a few billion years, our Sun will become a red giant, swelling to more than two hundred times its current size and engulfing Mercury, Venus and Earth. This, we’ve long believed, will be the ...

This is also true for our Sun, which is expected to turn into a red giant in about five billion years. When this happens, it will engulf Mercury, Venus, and likely Earth, turning them into ...