Physicists have a new scenario of the universe's expansion at the Big Bang that may explain why our universe has three large spatial dimensions.
Neutron stars colliding 130 million years ago produced gravitational waves and visible light that were recently detected by observatories around the world.
Researchers have pinpointed a "smoking gun" behind the phenomenon of the sun's atmosphere being thousands of degrees hotter than the solar surface.
Previously undetected matter was found in the form of gas filaments between galaxies, which is a major step toward explaining the structure of the cosmos.
Data from the Red Planet shows that conditions in the Eridania basin of Mars once resembled those on Earth when life first emerged billions of years ago.
An embarrassment for the US at the outset of the space race eventually gave way to a period of scientific diplomacy with Soviet researchers.
A three-way network of gravitational-wave detectors on different continents shows potential for learning more about Einstein's ripples in space-time.
Scientists have hypothesized that cosmic rays might originate in the Milky Way, but a dozen years of observational data points to extragalactic origins.
A new estimate of our planet's chemical composition will help scientists understand how the Earth formed 4.6 billion years ago.
Micrometeorite fossils embedded in the cliffs could help explain events that took place as many as 98 million years ago.