A new study suggests that pulsars are not the source of an unexpected surplus of antimatter particles detected by a space-based experiment. Dark matter remains a viable alternative explanation.
Using the light cast by galaxies bursting with new stars, astronomers have mapped out a piece of the cosmic web 12 billion light-years from Earth.
A new measurement fuels an ongoing debate about the rate at which today’s universe is expanding.
There are ghosts in our galaxy’s past. Now astronomers have found a way to detect them.
After decades of searching, astronomers have definitively detected helium hydride, the first molecule to form in the early universe.
Astronomers have found a way to turn quasars into standard candles, with potentially far-reaching implications for the nature of mysterious dark energy.
Nearly 11 billion years ago, the universe churned out stars at a rate 10 times greater than today. And yet all the starlight in the cosmos appears no brighter on the sky than a 60-watt light bulb seen from miles away.
HaloSat, a mini-satellite recently deployed from the International Space Station, is on the hunt for the universe's missing matter.
Astronomers have conducted the best, galaxy-scale test of general relativity yet, and it rules out some (but not all) theories of modified gravity.
A recent experiment to better understand the nature of dark matter constrains a possible "fifth force" of nature to almost zero.
A new method of measuring star formation in the earliest galaxies finds that they’re producing more massive stars than expected — a result that could affect our understanding of how galaxies grow their stars.
New observations suggest that stars were forming just 250 million years after the Big Bang — a record-breaker that will likely open a new line of cosmological inquiry.
Stephen Hawking’s last paper on cosmology, published posthumously, might solve the problem of eternal inflation, a theory that suggests our cosmos is but one in a sea of infinite universes.
A simple experiment has detected a signal from the first stars forming just 180 million years after the Big Bang. The observations have intriguing implications for the nature of dark matter.
A new suite of cosmological simulations sheds light on the interconnected cosmic processes that shape the universe.
Results from the first data release of the Dark Energy Survey include eleven new stellar streams in the Milky Way galaxy.
A combo of Hubble and Gaia data reveal the distribution of dark matter in a tiny galaxy by tracking the galaxy’s stars.
Astronomers have discovered a supermassive black hole scarfing down gas just 690 million years after the Big Bang.
LIGO has detected another black hole merger, raising the tally to five.
Spacetime ripples from the neutron star smash-up usher in the age of multi-messenger astronomy.
Three American physicists have received the Nobel Prize in physics for their contributions to the discovery of gravitational waves.
Teaming up with LIGO, Europe’s Virgo detector has bagged its first gravitational waves. The three-observatory detection enabled scientists to better pinpoint the merging black holes’ location.
Astronomers have detected more extremely energetic cosmic particles coming from one side of the sky than the other.
Have you ever considered the idea of a cosmic velocity web? Learn more about these intriguing visualizations from the study led by Daniel Pomarède.
Scientists are considering whether the mysterious “force” accelerating the universe’s expansion changes with time.