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 ...

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), ...

Thus, he argues, all units of astronomical distance, from the AU to the parsec (equivalent to 3.26 light-years, and derived from the apparent motion of nearer stars against the background that ...

If you guessed the astronomical unit, you are correct. The au — the rough distance between the Earth and the Sun — was previously determined by a ...

Next time a 5-year-old asks you how far the sun is, know you have the unanimous support of the International Astronomical Union (IAU) in answering clearly and confidently: 149,597,870,700 meters ...

On Monday, Nov. 11, 20199, Mercury will appear to pass across the disk of the sun as seen from Earth. This event — which astronomers call a transit — helped early astronomers measure distances ...