The Universe has been expanding since the Big Bang, says astrophysicist Alexey Vikhlinin of the Harvard-Smithsonian Center for Astrophysics and the Space Research Institute. The mystery is why it has been expanding with acceleration recently.
The Universe has been expanding since the Big Bang, says astrophysicist Alexey Vikhlinin of the Harvard-Smithsonian Center for Astrophysics and the Space Research Institute. The mystery is why it has been expanding with acceleration recently.