A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

In general, planetary nebulae (PNe) are expanding shells of gas and dust that have been ejected from a star during the process of its evolution from a main sequence star into a red giant or white ...

A groundbreaking new radio image reveals the Milky Way in more detail than ever before, using low-frequency radio “colors” to ...

The Ring Nebula, a well-known celestial structure in the Milky Way, presents astronomers with a mystery: a bar-shaped cloud ...

A new low-frequency radio image offers the most comprehensive view yet of the Milky Way’s southern sky. Astronomers at the International Center of (ICRAR) have produced the most detailed low-frequency ...

The Milky Way's plane cuts through the northwestern corner of Ara the Altar, blessing this southern constellation with a surplus of deep-sky delights. But perhaps none surpasses the stunning emission ...

Inside the bright but unassumingly named nebula Gum 55 lies a dark nebula — a rift of dust grains that absorb visible light — creating a swatch of darkness against the glow of bright gas. Fittingly ...

The Andromeda galaxy helped Edwin Hubble settle a great debate in astronomy. Stocktrek Images via Getty Images A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known ...