In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...

ESA’s decade-long Milky Way Gaia mapping mission still has tons of data to release over the next few years. Expect surprises.

The research team said these rings likely formed when a smaller galaxy shot through the heart of the Bullseye galaxy roughly ...

Our modern era of space observation and exploration deepens our connection with the universe—and with each other. When NASA ...

The Gaia mission, launched by the European Space Agency, has completed a decade of groundbreaking astronomical observations, collecting over three trillion data points on two billion stars and ...

The intrepid mapping mission has collected more than three trillion observations that'll change the way we see our neck of the cosmic woods.

Hubble revealed a universe of galaxies that existed beyond ours — but he couldn't have done it without a little help.

A century ago, Edwin Hubble first established that this so-called 'spiral nebula' was actually very far outside our own Milky Way galaxy -- at a distance of approximately 2.5 million light-years ...

Somewhere in between, humans realized the universe is much larger than our Milky Way — that the spiral nebulas visible ... universe beyond the Milky Way galaxy, but his work really stood on ...