We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

The July 2025 full 'Buck Moon' will give stargazers an opportunity to appreciate several distinct quirks of orbital mechanics ...

Adriano Anfuso/Vikas Chander The elliptical galaxy NGC 474 (lower right) contains multiple shell-like structures and tidal ...

Astronomers manning an asteroid warning system caught a glimpse of a large, bright object zipping through the solar system ...

July's full "Buck Moon" will be at its fullest on Thursday, July 10, and will be best seen at moonrise. It is the farthest ...

Interstellar comet 3I/ATLAS confirmed as the third from beyond our solar Livestream of 3I/ATLAS hosted by Virtual Telescope ...

A number of new and planned radio telescopes will consist of large arrays of low-gain antennas operating at frequencies below 300 MHz. In this frequency regime, Galactic noise can be a significant or ...

NASA telescopes in Chile have discovered a comet from interstellar space, making its closest approach in October.

Sedna will reach its closest approach to the Sun in 2076, providing a remarkable space-faring opportunity that won’t come ...