Milkdromeda with Andromeda on the left-Earth’s night sky in 3.75 billion years. No one will be here on Earth to see it. Maybe humans will have escaped the Sun’s becoming a Red Giant and observe it from a new home. Credit: NASA.

Milkdromeda with Andromeda on the left-Earth’s night sky in 3.75 billion years. No one will be here on Earth to see it. Maybe humans will have escaped the Sun’s becoming a Red Giant and observe it from a new home. Credit: NASA.