Interstellar Travel Could Be Possible Even Without Spaceships, Scientist Says

In about 5 billion years, the Sun will leave the main sequence and become a red giant. It'll expand and transform into a glowering, malevolent ball and consume and destroy Mercury, Venus, Earth, and probably Mars.

Universe Today readers are well-versed in the difficulties of interstellar travel. Our nearest neighboring solar system is the Alpha Centauri system.

If humanity had to flee an existential threat in our Solar System, and if we could identify a planetary home in Alpha Centauri, it would still take us over four years to get there – if we could travel at the speed of light!

There's lots of talk about generation starships, where humans could live for generations while en route to a distant habitable planet.

Those ships don't need to reach anywhere near the speed of light; instead, entire generations of humans would live and die on a journey to another star that takes hundreds or thousands of years.

It's possible that rogue planets, either in the Milky Way or some of the other hundreds of billions of galaxies, carry their own life with them in subsurface oceans kept warm by radiogenic decay.

We think of free-floating planets as dark, cold, and inhospitable. And they are unless they have warm subsurface oceans. But they also offer some advantages.