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 ...

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

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

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

Equuleus, also known as the Foal, is a small and faint constellation located southwest of Pegasus. Unlike many constellations, Equuleus lacks bright stars, nearby stars, prominent meteor showers, or ...

Mars and Spica will appear in close proximity (2° separation) in the evening western sky shortly after sunset, setting before 9 PM local daylight time. Observations of Mars and Spica are best ...

Temperature is a measure of the average energy of a collection of particles. (This is in contrast to kinetic energy, which is a measure of the energy carried by a single particle.) So, to answer a ...

Sound needs a medium (solid, liquid, or gas) to travel. Space is a vacuum, lacking the matter to carry sound waves. No sound in space means no echoes. While a near-perfect vacuum, some sounds can be ...

Yevgeny Khrunov, born September 10, 1933, was selected as one of the first Soviet cosmonauts in February 1960. He participated in the Soyuz 4/Soyuz 5 mission in January 1969, which involved the first ...

Venus, currently traversing Leo, rises around 4:00 A.M. local daylight time (LDT) at 40° N 90° W, preceding sunrise at 6:36 A.M. LDT. By 5:30 A.M. LDT, Venus reaches 15° altitude in the east, with ...