The Northern Lights loom behind rocks on the coast of Ireland in February 2023. A coronal mass ejection from the Sun allowed aurorae to be seen farther south than normal.
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.
