Cosmology is a research area in astrophysics that investigates the large-scale properties, origin, composition, and dynamical evolution of the Universe as a whole. It integrates general relativity, quantum field theory, and observational astronomy to construct and test models such as the ΛCDM paradigm, characterized by dark energy, cold dark matter, and baryonic matter. Cosmology addresses the expansion history, cosmic microwave background anisotropies, structure formation, and primordial nucleosynthesis, using data from galaxy surveys, gravitational lensing, supernovae, and cosmic background experiments to constrain fundamental parameters and probe physics at energy scales inaccessible to terrestrial laboratories.
Second only to black holes, neutron stars—incredibly dense star remnants—are the densest objects in the universe. When neutron stars collide, they create ripples in the fabric of space and time that we can detect on Earth.
Astronomy
Jun 30, 2026
1
48
The largest digital camera ever built is starting to capture images of unseen corners of the universe.
Astronomy
Jun 30, 2026
0
41
Earlier this year, the Dark Energy Spectroscopic Instrument (DESI) completed observations that mapped 47 million galaxies across 11 billion light-years, allowing astronomers to better evaluate the large-scale structure of ...
Gravity, the force that attracts objects toward each other, is currently framed by Albert Einstein's theory of general relativity. This framework describes gravity as the curvature of spacetime, the invisible four-dimensional ...
A new look at the heart of our Milky Way galaxy by Euclid, an ESA (European Space Agency) mission with NASA contributions, overlaps with a region scientists will observe with NASA's Nancy Grace Roman Space Telescope, launching ...
Astronomy
Jun 24, 2026
0
25
Astronomers using NASA's Hubble Space Telescope have found something they never expected—ultraviolet light from a galaxy that existed just 1.4 billion years after the Big Bang. That galaxy contains tightly clustered young ...
Astronomy
Jun 23, 2026
0
33
Dark matter is often portrayed as a cosmic loner, interacting with itself and the rest of the universe only through gravity. But what if dark matter particles also exert a hidden force on one another?
Astronomy
Jun 23, 2026
1
53
Just a few hundred million years after the Big Bang, the universe was a dark and simple place. There were no galaxies like the Milky Way, no planets, and no heavy elements such as carbon or oxygen. Instead, vast clouds of ...
Astronomy
Jun 22, 2026
0
21
A stunningly concentrated and hefty galaxy cluster, from a time in the universe's history when such massive structures aren't expected to have fully formed yet, is challenging cosmic evolution theories. Across a series of ...
Astronomy
Jun 19, 2026
2
311
This NASA Hubble Space Telescope image features a galaxy cluster called CL0016+1609, or MACS J0018.5+1626, that is very bright at X-ray wavelengths and is one of the most extensively studied clusters at X-ray and radio wavelengths. ...
Astronomy
Jun 18, 2026
0
30
