European Space Agency (ESA) is trying to measure the exact distance to the celestial body in the Gaia project of the Space Telescope mission. .. Astronomers are concerned with the 'expansion rate of ...

Let’s try a demonstration that we all enjoyed in elementary school. Close one eye, hold out your thumb at arm’s length, and align it with an object on the other side of the room. Without moving your ...

Astronomers once struggled to measure the true size of the universe. Then came the discovery of Type Ia supernovae — ...

How big is the universe? In the early twentieth century, scientists took sides. One held that the entire universe was contained in the Milky Way galaxy; their champion was the strong-willed astronomer ...