
Planets
Analyze This: Some 5,000 planets orbit stars other than our sun
A new cache of confirmed exoplanet discoveries marks a milestone in planets found beyond our solar system.
A new cache of confirmed exoplanet discoveries marks a milestone in planets found beyond our solar system.
As private companies prepare to sprinkle space with tens of thousands of satellites, experts worry about the mushrooming threat of space junk.
Dark energy is the unknown force causing the universe to expand faster and faster.
The force of gravity holds us on the ground, keeps planets in orbit and extends throughout space. A very weak gravitational pull is called microgravity.
The James Webb Space Telescope has been in the works for so long that new fields of science have emerged for it to study.
The spiral-shaped Whirlpool galaxy may be home to the first planet spotted outside our own Milky Way galaxy.
In the 15 years since Pluto lost its status as a planet, some scientists continue to use whatever definition works best for them.
Meteor showers happen when Earth’s orbit passes through trails of debris left behind by comets or asteroids.
In a dozen years or so, the tide-enhancing effects of a wobble in the moon’s orbit should lead to dramatically higher sea levels in some coastal cities.
These observations offer some of the best evidence yet that planets around other stars have moons, or exomoons.