Meaning of ultra-diffuse | Babel Free

Definitions

1. Extremely diffuse.
2. Specifically, designating a type of galaxy with a very low proportion of visible stars compared to the Milky Way, and hence a very low luminosity.

Examples

“In the next sections we study the properties of galaxies that satisfy our criteria to be ultra diffuse, and consider the contribution from galaxies in the fore- and background using the CFHTLS fields.”

“The galaxy, called NGC1052-DF2, is about 65 million light years away. It is almost as big as the Milky Way but is “ultra-diffuse,” meaning it contains just a vanishing fraction of the stars found in our galaxy—only 1 percent, in this case.”

CEFR level