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 ...

Using data from NASA’s InSight lander, Constantinos Charalambous from the Imperial College of London and colleagues studied ...

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

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

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 ...

Use the Big Dipper to locate Polaris, the North Star. Orion's belt helps find other bright stars like Sirius. Follow the Big Dipper's handle to find Arcturus and Spica. The Summer Triangle is formed ...

The universe began with an unimaginably hot, dense state. Inflation rapidly expanded the universe's size. Before inflation, the universe existed in a period called the GUT era where forces were ...