The waning Moon steps up to form a triangle in the early-morning sky with two distant planets: Saturn and Neptune.

There are big challenges associated with such a mission, from readying a craft quickly to finding the comet and sending data ...

Mercury reaches its greatest western elongation at 4 A.M. EDT, standing 19° from the Sun. The tiny planet reaches an altitude of almost 5° above the eastern horizon an hour before sunrise, glowing at ...

Solar and lunar eclipses both occur this month, as Mars and Jupiter meet in the early morning and the Perseid meteor shower peaks.

Mercury reaches its greatest western elongation, Iapetus passes close to Saturn, and the Moon occults the Pleiades in the sky ...

SpaceX flies a classified NRO mission from Cape Canaveral, China launches back-to-back Long March rockets in a single day, ...

The solar system’s smallest planet comes to a standstill this afternoon, ending its current retrograde path and beginning to ...

This rich grouping of young suns shines brightly in Aquila the Eagle, ripe for observing just after sunset and before ...

The Alpha Capricornid and the Southern Delta Aquariid meteor showers peak overnight, but the bright Moon will run ...

Rising shortly after sunset, July’s Full Moon, called the Buck Moon, dominates the sky tonight with its bright light.