Astronomy
Habitable Zones in Space
Quick fact
A star's habitable zone changes over its lifetime: as a star ages and grows brighter, the zone shifts outward, potentially making once-frozen worlds habitable.
Why this is interesting
Earth sits at just the right distance from the Sun to keep water liquid—too close, it boils; too far, it freezes. Could other stars have their own 'just right' zones where life might thrive?