Astrophysics

The Planck satellite reveals the universe's first stars formed more than a hundred million years later than previously believed

Today is Valentine’s Day. In love? Or just the opposite? Express how you feel with physics-inspired Valentines—and anti-Valentines for those who perhaps aren’t huge fans of the holiday.

Astronomers have discovered variable stars that periodically dim and brighten at frequencies close to the famed golden mean

The much-hyped James Webb Space Telescope promises to revolutionize exoplanet science, but only if astronomers can agree on how to use it.

Some natural phenomena need few words to explain why they’re fascinating. Eclipses, transits, and phases in astronomy tend to fall into that category.

Cosmologist Kendrick Smith will present a free live Webcast on the quest to understand the origin of the universe
 

The crew of STS-51-L: Front row from left, Mike Smith, Dick Scobee, Ron McNair. Back row from left, Ellison Onizuka, Christa McAuliffe, Greg Jarvis, Judith Resnik.

Intriguing data from an event in 2007 hints at an exomoon forming around a giant planet in a youthful star system 420 light years from Earth.

In 1990, NASA's Voyager 1 spacecraft briefly looked back from its journey out of the solar system, capturing a view of the faraway Earth. Carl Sagan called it the "pale blue dot." From more than 6 billion kilometers away, beyond the orbit of Pluto, it seemed remarkable that our planet was even visible.

Scientists must now decide whether the anomalous signal is truly exotic or has a more mundane provenance

I’ve always been an Edgar Allan Poe fan, so much so that I even watched the horrifying—not in a good way–2012 film The Raven.

President Obama made a rare shout-out to space in Tuesday's State of the Union Address, referencing NASA's recent Orion capsule launch and addressing astronaut Scott Kelly in the audience at the Capitol.