Hubble’s “magnum opus”: most precise measurement of universe’s expansion (photo)
We have known for the better part of a century that the universe is expanding by the observation that galaxies are moving away from us
NASA’s Voyager 1 is sending mysterious data from beyond our solar system
Scientists are unsure what it means
Astronomers might’ve discovered why Saturn’s moon Titan looks like Earth
On the surface, the landscape is cut by flowing rivers of liquid methane, and the land itself is made up of hydrocarbons
