The European Space Agency’s Herschel Space Observatory is designed to collect long-wavelength radiation from some of the coldest and most distant objects in the universe. In this image, Herschel has photographed a previously unseen stellar nursery, where it is estimated that up to 700 newly forming stars are crowded into the dust cloud seen [...]

Space is probably infinite, but we can see only the part that contains stars or galaxies whose light has been able to reach us, says Francis Halzen, a professor of physics.
The universe originated about 13.7 billion years ago with the Big Bang, so light cannot have been traveling for more than 13.7 billion years. “Since [...]

A question from a very young reader, as relayed by his mother: “Where does the future come from, mommy? I don’t understand. How does it get here?”