How do galaxy clusters form and evolve? Counting galaxies of different luminosities, masses, and colors can yield surprising insights.
More than 50 years ago, a Norwegian astronomer named Sjur Refsdal outlined an interesting new method for calculating the Hubble constant. Last November, astronomers found the perfect test case.
Measuring CMB distortions caused by gravitational lensing is a unique way of estimating galaxy cluster masses.
The El Gordo (in Spanish, “the fat one”), one of the most massive galaxy clusters observed, is an active merger of two large subclusters. Unraveling its dynamics provides insights into $latex \Lambda$CDM.
The Sunyaev-Zeldovich effect is a unique way of searching for galaxy clusters that complements multi-wavelength imaging efforts.
Explore an astrophysical classic describing the effect of the Universe’s expansion on the seeds of galaxies.