The habitable zone is also known as the "Goldilocks zone" because planets orbiting at that "just right" distance from a star are not too hot or too cold to host liquid water. If planets are closer to their star, the water turns to steam; if they're farther, it freezes.
The Goldilocks zone is different around each star. Bigger, hotter stars like the sun, a G-type star, have a wider habitable zone, while smaller red dwarfs confine habitable planets to a narrower range, according to NASA (opens in new tab) .
Could there be a "Planet 9"? Hot moons could hold the key
The hypothetical “Planet 9,” (also known as Planet X if you believe Pluto is still our ninth planet ), which may or may not be hiding on the periphery of our solar system, could be out there and surrounded by a small swarm of potential moons.
According to astronomer Man Ho Chan from the Education University of Hong Kong, there could be as many as 20 moons surrounding Planet 9 , each measuring up to about 62 miles (100 kilometers) in diameter.
Goldilocks zone: Everything you need to know about the habitable sweet spot https://t.co/HiglObcEiR https://t.co/aQks0v4Gdb SPACEdotcom (from NYC) Thu Feb 16 16:34:06 +0000 2023
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