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)

NASA's all-female spacewalk is back on

What to see in the night sky in October

Why a massive black spot suddenly appeared on Jupiter

9 surreal images of Venus

Why we can't stop thinking about warp drive

Venus may have once boasted Earth-like temperatures, oceans and even life

NASA shows us a supermassive black hole in all its warped, weird glory

Say hello to the first known comet from outside of our solar system

NASA's new mission will spot killer asteroids before they sneak up on us

Earth's ozone layer still in trouble, study finds

12 incredible images of Saturn

Scientists thrilled to find water vapor in exoplanet's atmosphere

SPONSORED