If you continue zooming in on the universe, the familiar world quickly dissolves. Molecules turn into atoms, atoms into ...

A cosmic zoom-out shows the vast scale of the universe, highlighting billions of galaxies and raising the question of whether ...

Windows to the past, stars can unveil the history of our universe, currently estimated to be 14 billion years old. The farther away the star, the older it is — and the oldest stars are the most ...