Charles Q. Choi

The Milky Way, it turns out, has exactly the right name.

The rings are around a potential planet, or even a star, 420 light-years away.

One of the newfound worlds is about the size of Mars.

The two Tatooine planets with twin suns are near the habitable zones of their stars.

The galaxy cluster weighs as much as 2 quadrillion suns.

Earth-like planets could exist with two suns, scientists say

Mineral was discovered during Apollo 11 mission.

If you thought forecasting Earth's weather was tough, you haven't been to Titan.

A new study of fruit flies in simulated microgravity could help scientists understand the effects of space travel on humans.

The 2012 winter solstice will not bring about destruction of the planet, scientists say.

Microbes can survive in frigid lava tubes on Earth — and perhaps Mars as well, scientists say.

China plans more moon missions, including a robotic lunar sample return flight in 2016.

The mystery of Mercury's weak magnetic field may be solved.

The giant black hole at the center of our galaxy is about to chow down on something monster meal.

New research suggests a giant asteroid may have knocked into Mercury and changed its spin.

No secret planet called Nibiru exists, and the Mayan calendar does not end.

From the Big Bang to dark matter, Antarctic astronomy is probing the deepest mysteries.

Seismic shivers inside stars reveal their innards are spinning surprisingly fast.

Best view yet of strange elves and sprites high in atmosphere.

Two newly discovered black holes tip the scales at more than 9 billion times the mass of our sun.

NASA's Voyager probes are revealing an unprecedented view of our Milky Way galaxy.

Gamma-ray light is pouring out from some interesting spots in space.

The Christmas sky last year was lit up by an extraordinarily powerful and mysteriously long explosion.

Billions of ethereal particles known as neutrinos pour through us every second.

The origins of cosmic rays have been a mystery to scientists.