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 [...]

At the South Pole, giant telescope searches for elusive neutrinos, hoping to find evidence of huge explosions in the distant universe. In neutrino astronomy, ice is definitely nice!