Did Water Exist in the Galaxies of the Early Cosmos? (Holiday Feature)


Early Galaxy SPT0311-58


It has been said that to understand water is to understand the cosmos and life itself. 2021 observations from the Atacama Large Millimeter/submillimeter Array (ALMA)  detected this primal substance in the most massive galaxy in the early Universe.


Was the First Planet Beyond the Milky Way Discovered, or Something Even More Exotic? (Weekend Feature)


Whirlpool Galaxy


In 2019 the Nobel Prize in Physics was awarded to Michel Mayor and Didier Queloz for pioneering a new field in astronomy with the discovery of the first planet beyond our solar system, 51 Pegasi b. Since the discovery in 1991, over 4,000 exoplanets have been found in our home galaxy. “We answered a very old question,” Mayor said, which was debated by philosophers since the ancient Greeks: “are there other worlds in the Universe?”


Dark-Matter-Free Galaxies: “We Have No Idea Why They Exist”  


DF4 Galaxy


“The interesting thing is: we have no idea!” says Pieter van Dokkum, Sol Goldman Professor of Astronomy at Yale University, who wrote in an email to The Daily Galaxy about why ultra-diffuse galaxy DF2 contains no dark matter. “The existence of this galaxy shows that there is another pathway to creating galaxies than our standard picture, but what that might be is anyone’s guess.”


Ancient Ghost Galaxy Hidden In the Milky Way’s ‘Zone of Avoidance’ (Weekend Feature)

Antlia 2 Galaxy


An enormous ‘ghost’ galaxy, believed to be one of the oldest in the universe, was detected lurking on the outskirts of the Milky Way in November of 2018 by a team of astronomers who discovered the massive object when trawling through new data from the European Space Agency’s Gaia satellite. The object, named Antlia 2 , avoided detection thanks to its extremely low density as well as a perfect hiding place in the Zone of Avoidance, named by Edwin Hubble in 1929,  behind the shroud of the Milky Way’s disc–a region full of dust and an overabundance of bright stars near the galactic center 


An Unknown Phenomenon? Distant Galaxies Had Simultaneous Creation of Stars

Cosmic Web


An unknown phenomenon was discovered in the Universe in 2021: three dozen dwarf galaxies far from each other had a simultaneous birth of new stars, an unexpected discovery that challenged theories on how galaxies grow.


The Missing Galaxy: “Milky Way’s Long-Lost Companion We Didn’t Know Existed”

Andromeda Galaxy


“It was shocking to realize that the Milky Way had a large sibling, and we never knew about it,” said Eric Bell, University of Michigan professor of astronomy in 2018 about his discovery that the Andromeda galaxy (also named M31), our closest large galactic neighbor, shredded and cannibalized a massive galaxy two billion years ago.