Astronomers use many methods to determine this number, including gravitational lensing, the universe’s expansion rate, and more.

September’s Full Corn Moon is eclipsed for some observers, Titan passes behind Saturn, and Mars moves north of Spica in the ...

Saturn’s largest moon, Titan, transits with its shadow early this morning, passing over the planet’s northern polar region.

Researchers have spotted a Jupiter-like gas giant forming in the disk around a young sun — earlier in the star's lifetime ...

The Red Planet’s mantle is giving scientists clues to its geological history.

Today in the history of astronomy, NASA announces evidence of material being consumed by the black hole at the center of our ...

Viking 2, a Mars lander nearly identical to Viking 1, successfully landed on Mars approximately one month after Viking 1's ...

Ice giant Uranus is in Taurus, floating near the Pleiades star cluster and easy to locate in the early-morning sky.

On September 12, Mars will appear near Spica, while the Moon will pass near Uranus. The Pleiades and the Hyades star cluster will also be visible. Mercury will be in superior conjunction on September ...

Planetariums around the world are invited to participate in this year’s edition of the IAU’s annual outreach event.

President Donald Trump has announced that the U.S. Space Command will relocate from Colorado to Huntsville, Alabama.

Nabta Playa, located in Africa, is the oldest known stone circle, predating Stonehenge by over 2,000 years, and is considered a potential early astronomical observatory, aligned with stars such as ...