The most accurate distance measurement yet of ultra-diffuse galaxy (UDG) NGC1052-DF2 (DF2) confirms beyond any shadow of a doubt that it is lacking in dark matter. The newly measured distance of 22.1 +/-1.2 megaparsecs was obtained by an international team of researchers led by Zili Shen and Pieter van Dokkum of Yale University and Shany Danieli, a NASA Hubble Fellow at the Institute.
"In the 1950s, four decades before he won a Nobel Prize for his
contributions to game theory and his story inspired the book and
film “A Beautiful Mind,” the mathematician John Nash
proved one of the most remarkable results in all of geometry.
"Sgr A*, the 4.6-million-solar-mass black hole that lies at the
center of the Milky Way, is normally a fairly quiet beast. The
black hole slowly feeds on accreting material in the galactic
center — but this food source is sparse, and Sgr
Wormholes are spacetime connections between distant spacetime
regions. While some have speculated that they could
be used to travel faster than light, our current understanding
of general relativity and quantum matter...
Stargazers know all too well the challenges of observing the
night sky on a cloudy evening. Fortunately, waiting a night or two
can help to resolve the issue. But what happens if these clouds are
light years away and lie seemingly dormant in the...
It is well known that the expansion of the universe is
accelerating due to a mysterious dark energy. Within galaxies,
stars also experience an acceleration, though this is due to some
combination of dark matter and the stellar density. In a new...
"Within our galaxy, there are thousands of stars that orbit the
center of the Milky Way at high velocities. On occasion, some of
them pick up so much speed that they break free of our galaxy and
become intergalactic objects. Because of the extreme...
If a picture is worth a thousand words, what might the first
horizon-scale image of a black hole tell us? A new paper by
researchers from the Event Horizon Telescope (EHT) collaboration,
which famously imaged M87’s central black hole, has provided