GS-z13-1, marks the earliest sign yet spotted of the era of cosmic reionization at 330 million years after the Big Bang.

The planets offer exciting views in April for both night owls and early risers. Plus, the Lyrid meteor shower peaks in ...

I pick out North America’s celestial highlights for the week ahead (which also apply to mid-northern latitudes in the ...

Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.

A century ago, Edwin Hubble revolutionized our understanding of the universe by proving that the Milky Way is just one of ...

On March 29, skywatchers across parts of the Northern Hemisphere will be treated to a rare astronomical double feature: a ...

Supersymmetry, long considered the golden child of theoretical physics, has officially lost its luster at the world’s ...

The slow race of getting NASA's Space Launch System rocket pieced together for next year's Artemis II moon mission jumped a ...

Out past Neptune are countless small icy and rocky bodies called Trans-Neptunian Objects (TNOs), and many of these have moons ...

Plus: Observe two stunning spirals, see Venus reappear as a morning star, and enjoy the Last Quarter Moon in the sky this ...

If you want vast ocean views, Jupiter’s biggest moon Ganymede is the place to be. The moon is larger than Mercury and would be classed as a planet if it were orbiting the Sun rather than Jupiter.