It's been 25 years since the Space Shuttle Discovery lofted the Hubble Space Telescope into orbit. Yet astronomers were not unanimous in their enthusiasm for the project, as this debate from 1990 recalls.
Thanks to NASA’s Dawn spacecraft, we’re finally seeing more of the asteroid Ceres than a fuzzy ball.
In the first of a series of installments written exclusively for Sky & Telescope, New Horizons principal investigator Alan Stern offers his behind-the-scenes perspective on what it took to get the spacecraft to Pluto.
NASA has selected the design for its Asteroid Redirect Mission, opting to retrieve a boulder from a larger asteroid.
NASA’s MAVEN spacecraft has detected dust high in Mars’s atmosphere and auroras across the planet’s northern hemisphere.
With just weeks left before it crashes into its host planet, NASA's Messenger spacecraft is making the most of its extremely low altitude and finding that Mercury isn't a completely dead world.
With the goal of better understanding Earth’s space weather environment, NASA’s Magnetospheric Multiscale (MMS) mission launched just over an hour before midnight on March 12th from Cape Canaveral.
A radar sounder aboard China's first-ever lunar lander found at least nine discrete subsurface layers at its landing site in northern Mare Imbrium.
The long-distance traveler has finally arrived at the first dwarf planet (and largest asteroid) yet studied by spacecraft.
Incoming views of the asteroid belt's largest body reveal spots where ice from the interior might be exposed on the surface.
This image series, taken by NASA’s New Horizons spacecraft in late January 2015, reveals the dwarf planet Pluto and its largest moon, Charon, orbiting their common center of mass.
Once the Rosetta spacecraft arrived at Comet 67P/Churyumov-Gerasimenko last August, European scientists used an array of instruments to assess every nook and cranny of the remarkable two-lobed nucleus.
It's been 11 years since the British-built Beagle 2 lander dropped to the Martian surface and disappeared without a trace. Now we know what happened to it.
The Hubble Space Telescope is commemorating its 25th anniversary with a second look at the Pillars of Creation — but there’s hard science behind these pretty pictures.
NASA’s NuSTAR mission recently returned a striking image that shows the Sun’s active regions crackling with X-rays.
A highly successful spacecraft has ended its mission after returning nearly a decade of data on Earth's nearest planetary neighbor.
The exact location of Philae’s landing site remains unknown, though the site’s topography might allow the lander to operate longer than planned. Meanwhile, Rosetta is detecting organics and heavy elements even when Comet Churyumov-Gerasimenko is far from the Sun.
NASA’s Curiosity rover has detected both methane in Mars’s atmosphere and carbon-bearing organic compounds in its rocks. But it’s unclear where these molecules come from — or whether there’s any biological connection.
NASA’s MAVEN mission has discovered a new population of particles in Mars’s upper atmosphere. It’s also found a plume of particles escaping from the planet’s poles, confirming atmospheric loss is happening today.
An early outcome from Rosetta's scrutiny of Comet 67P/Churyumov-Gerasimenko is that the isotopes in its water have distinctly different ratios than those on Earth.
NASA's Dawn spacecraft spent 14 months photographing Vesta from close range. Now geologists have completed a global map of the asteroid's surface geology.
Right on cue, New Horizons spacecraft has awakened from its final electronic hibernation. Seven months from now, it will make the first-ever visit to Pluto.
On December 5th, NASA successfully launched the first test flight of its Orion capsule. Scheduled to carry astronauts beyond low-Earth orbit in the 2020s, the spacecraft is NASA’s first deep-space people transporter since the Apollo days.
Japan's second asteroid-sample mission launched successfully on December 3rd after weather delays. If successful it will reach asteroid 1999 JU3 in 2018, explore for 18 months, and then return to Earth with souvenirs.
Despite rescue efforts, no one has heard from one of two NASA spacecraft on the far side of the Sun since October 1st.