The lunar crescent will disappear below the horizon before midnight on Jan. 22.

By a small margin, Titan is the second-largest moon in the solar system, and is also the only moon with a thick atmosphere.

Looking for a sky event this week? Check out our full Sky This Week column. January 22: Explore the Rosette Nebula The Moon passes 4° north of Saturn at 8 A.M. EST, then passes 4° north of Neptune at ...

Sky This Week is brought to you in part by Celestron. Friday, January 23Pluto reaches conjunction with the Sun at 5 A.M. EST.

Portugal has entered the small group of countries with experimental capability in hypersonic research ...

Scientists have discovered that hydrogen cyanide forms strange "icy cobwebs" at low temperatures. These structures act as a ...

Do you know which planet could float in a giant bathtub? Discover the science behind its low density, its hundreds of moons, ...

Sky This Week is brought to you in part by Celestron. Friday, January 9Cygnus may be sinking toward the horizon a few hours ...

The Instituto Superior Técnico (IST) conducted its first hypersonic test, in which the speed reached is equivalent to "crossing mainland Portugal, from north to south, in just over five minutes," the ...

LISBON, Jan. 22 (Xinhua) -- Portugal has carried out its first hypersonic test under real conditions, marking the country's entry into experimental research on extreme high-speed flows, the Instituto ...

Researchers report that frozen hydrogen cyanide crystals can enable highly reactive chemistry at low temperatures.

NASA and the Department of Energy signed an agreement earlier this week committing to put a nuclear reactor on the moon in ...