A young star 1,300 light-years away has given astronomers something they have dreamed about for decades: a freeze-frame of ...

For centuries, humanity believed that Earth was the center of the universe, a view championed by Aristotle and Ptolemy. But ...

For reference, Pluto’s average distance from the Sun is about 40 AU, so 2023 KQ14 is quite distant. At 23.4 billion miles (37 ...

Researchers just got a step closer to understanding the origins of our solar system, with the discovery of an object orbiting ...

Alone among known planets, Earth has vast oceans on its surface and its landmasses are marked with lakes and extensive river ...

Astronomers are scrambling to gather data on a mysterious object that’s currently hurtling through the solar system.

When white dwarfs—the hot remnants of stars like our sun—are orbited closely by another star, they sometimes steal mass away ...

After hundreds of years of approximating the distance between the Earth and Sun, the Astronomical Unit was recently redefined as a set value rather than a mathematical equation.

Now the diameter of the known universe can be described as 558 billion trillion miles (that’s 558 followed by 21 zeros) or 28 ...

Some of that seems to be related to a general lack of familiarity with what an astronomical unit actually is (it's the distance from Earth to the sun, for the record), but there's also the fact ...

Using parallax during the transits of Venus, astronomers were given the best opportunity available to measure the distance from the Earth to the sun — known as one astronomical unit.

THE world's top astronomical body has endorsed the definition of the Astronomical Unit (AU), a measurement used to calculate the distance between stars and planets.