'Proxima Centauri is the second-closest star to the Earth; this is the closest'
The sun
SCIENCE: Proxima Centauri is the second-closest star to the Earth; this is the closest
Proxima Centauri is the second-closest star to the Earth; this is the closest
Proxima Centauri is the second-closest star to the Earth; this is the closest
SCIENCE
The sun
SCIENCE