Proxima Centauri

red dwarf · the closest star to the Sun

4.2 light-years from Earth

A small, cool, flaring red dwarf 4.25 light-years away. Its planet Proxima b orbits in 11 days inside the zone where water could be liquid.

• 15% of the Sun's width, 0.2% of its light
• frequent flares brighten it many times over

kind

star

size

215,000 km across

orbiting it

Proxima b