Space

Milky Way galaxy's Great Rift
Space is the void and the physical universe that exists outside Earth's atmosphere and between celestial bodies. Space is a near-perfect vacuum with little matter, save for dispersed particles, radiation, dark matter and dark energy.
 
Space is virtually limitless, and its size is difficult to define or comprehend. Scientists estimate there are more than 100 billion galaxies in space, with the largest containing 400 billion stars. Our galaxy, the Milky Way, has 100 billion stars. Other celestial bodies, such as planets, nebulae, asteroids, black holes, quasars, etc. litter space as well. Owing to space's incalculable size, these objects are often immense, numerous in number and spread vastly far apart from each other.
 
Humans developed adequate technology and began exploring space in the 20th century. While space agencies such as NASA have launched various probes and unmanned spacecraft to explore our solar system, humans themselves have only landed on the moon thus far. Advancements in telescope technology, however, have given us a remarkably sweeping view across the known universe. (Photo: Shutterstock)

5 reasons why the James Webb Space Telescope is such a big deal

4 things you can do for science from home

What to see in the night sky in April

Why approaching comet ATLAS is so bright (and how you can see it)

8 things to know about the vernal equinox

Scientists don't know why Polaris is so weird

Meet the women of NASA

This unusual hole on Mars could be a gateway to hidden wonders

Astronomy student discovers 17 alien worlds

What to see in the night sky in March

A second, smaller moon has been hanging around our planet for years

Astronomers just detected the largest explosion in our universe since the Big Bang

SPONSORED