This shot of the aurora practically turns night into day. At right, the Moon looms a Sun-like orange in the sky.
The pristine star formed outside the Milky Way and later drifted into our galaxy.
The collision likely resembles the one that formed the Moon around 4.5 billion years ago.
Without the mass stellar migration, life may not have been able to form on Earth.
Service workers, meet the future.
Venus may be hiding a vast network of underground caves carved by ancient lava.
A closer look at the planets around a star called LHS 1903 may just flip our understanding of how planetary systems form.
The Northern Lights over Vestrahorn, a mountain in Iceland. Photo: Lorenzo Ranieri Tenti 
