New theory of secondary inflation expands options for avoiding an excess of dark matter

A new theory suggests a shorter secondary inflationary period that could account for the amount of dark matter estimated to exist throughout the cosmos.

Signs of second largest black hole in the Milky Way: Possible missing link in black hole evolution

Astronomers using the Nobeyama 45-m Radio Telescope have detected signs of an invisible black hole with a mass of 100 thousand times the mass of the Sun around the center of the Milky Way.

Brightest-ever supernova still baffles astronomers

Origin of exploding star that is twice as luminous as any other remains unclear. Seven months after it was first spotted, a puzzle still hangs over the origin of the brightest supernova ever seen.

NASA's Juno probe sets solar power distance record en route to Jupiter

NASA launched the Juno spacecraft in 2011 on a mission to study Jupiter, and now the spacecraft is almost to its target. Before it reaches the gas giant, Juno has already made history as it sets the distance record for solar power.

String Theory Might Merge With the Other Theory of Everything

In the last few decades, researchers have pursued the problem in two separate programs—string theory and loop quantum gravity—that are widely considered incompatible by their practitioners. But now some scientists argue that joining forces is the way forward.

Stephen Hawking reckons he's cracked the black hole paradox

Last August, Stephen Hawking tantalised the world by saying he'd worked out a solution to the “black hole paradox”. He's now dropped the first detailed discussion of his hypothesis for the world to pore over, here at ArXiv in a paper entitled Soft hair on black holes.

The Future of Space Exploration

Astronauts and NASA personnel look the future and where they think the space program will go next.

Most distant massive galaxy cluster identified

Formed in the first 4 billion years of the universe, cluster is 1,000 times more massive than the Milky Way.

10 Questions for Alan Guth, Pioneer of the Inflationary Model of the Universe

The theoretical physicist discusses the expanding universe and the infinite possibilities it brings.

NASA's Kepler Comes Roaring Back with 100 New Exoplanet Finds

Kepler has now discovered more than 100 confirmed alien planets during its second-chance K2 mission, researchers announced today (Jan. 5) here at the 227th Meeting of the American Astronomical Society (AAS).

NASA Is Taking Asteroid Threats To Earth Seriously, Forms New Defense Office

NASA announced the creation of the Planetary Defense Coordination Office on Thursday. Pictured are orbits of near-Earth asteroids (blue) and potentially hazardous asteroids (orange).

Outer Space Will Be 2030's Hottest Travel Destination

Some of us may have moved on from our dream of being an astronaut when we grow up, but that doesn’t mean we can hide our excitement about the latest advancements in space travel.

SpaceX's rocket landing is a big moment for Elon Musk and for the economics of the space business

By launching a cargo of satellites into orbit and returning the rocket booster to a vertical landing on earth, Elon Musk’s SpaceX has reached the next major milestone in its quest to reduce the cost of reaching space, with the potential to disrupt the entire rocket industry.

REVEALED: Inside the heart of a galaxy-guzzling supermassive black hole

NASA has obtained its best ever images of a supermassive black hole and the mysterious ring that feeds the galactic gobbler.