Ker Than

Astronomers have spotted evidence of a second Earth being built around a distant star 424 light-years away.

Sputnik changed how scientists in every discipline did science.

Puffy debris disk around three nearby stars could harbor Pluto-sized planets-to-be.

SOHO catches its first periodic comet.

Steven Weinberg says the International Space Station an 'orbital turkey.'

The universe's first stars could help distinguish between two dark matter models.

Finding could be good news for the future of Earth.

A dead, spinning star is feeding on its stellar companion, whittling it down to a planet-sized object.

The ultrafaint galaxies contain about 99 percent dark matter, a new study find.

The few minutes could mean a world of difference for understanding the planet.

The dry, frozen surface could be home to organisms, a scientist speculates.

For the first time, scientists are seeing the planet's rings free of glare.

A new study supports the idea that martian water might have been blown away by solar wind.

Two asteroids might have once belonged to long eroded mini-worlds.

Scientists urge caution until the results can be confirmed.

Critics say the evidence is faulty.

Mira A is trailing a comet-like tail of glowing gas 13 light-years long.

But scientists are hesitant to say they are alive.

Or is it ageless?

A Mars dust storm has settled slightly allowing NASA rovers to power up.

A major cosmic pileup involving four large galaxies could give rise to one of the largest galaxies the universe has ever known.

The largest planet ever discovered theoretically should not even exist, scientists say.

Hardy microbes and new planets make scientists hopeful.

A newly discovered solar system could be a preview of our sun's fate.

A bright arc could be the source of Saturn's mysterious G-ring.