Astronomy
The Black Sheep of Black Holes
This potential member of the cosmic zoo may explain a lot about how the cosmos is structured.
The Mystery of the Dark Asteroid That Scorched Russia
A new theory emerges to explain the enigmatic Tunguska Event.
The Trouble with Counting Alien Civilizations
Life on Earth is a sketchy guide to intelligent life in the cosmos.
How the Cosmic Dark Ages Snuffed Out All Light
The recent discovery of some of the first galaxies in the universe illuminates the darkest era in cosmic history.
An Open Letter to Telescope Protesters in Hawaii
Why astronomy on Mauna Kea is not a desecration but a duty.
New Wrinkle Added to Cosmology’s Hubble Crisis
Two independent measurements of the universe’s expansion give incompatible answers. Now a third method, advanced by an astronomy pioneer, appears to bridge the divide.
‘Radical Change’ Needed After Latest Neutron Star Collision
A recent neutron star merger has defied astronomers’ expectations, leading them to question longstanding ideas about neutron stars and the supernovas that create them. “We have to go back to the drawing board.”
Galactic Settlement and the Fermi Paradox
The results of galactic colonization models are a mixed bag for SETI optimists.