Absolute magnitude, unlike apparent magnitude ... making them useful "measuring sticks" if the stars are embedded in galaxies or nebulae. Ultimately, this allows us to estimate the expansion ...

In general, dwarf galaxies are the most numerous in the ... at a redshift of approximately 0.02, with an r-band absolute magnitude of -19.17 mag. The galaxy has an overall fairly round shape ...

are very faint with absolute luminosity in the optical waveband below -8 magnitude. These are so-called "ultra-faint dwarf galaxies." However, previous searches made use of telescopes with a ...

Curtis argued they were galaxies, each like the Milky Way ... Hubble derived an absolute magnitude of –5.0. He then calculated that for a Cepheid this bright to exhibit an apparent magnitude ...

"This work has pushed the science with Herschel to its absolute limit, probing far below what we can normally discernibly see and potentially revealing a completely new population of galaxies that ...

The earliest estimates of the number of galaxies in the Universe were very small. For centuries, astronomers thought there might be just one—our own. Most recent estimates built off observations ...

"To introduce some constraints into the timing of the quenching of star formation, I used two properties of galaxies combined together in the color-magnitude diagram. When studied at different ...

The galaxies were discovered via data from the Sloan Digital Sky Survey (SDSS), which mapped one-quarter of the entire sky over Earth in great detail, determining the positions and absolute ...