See how our seasons come from Earth's tilt and yearly loop around the sun, which changes the ice cover, vegetation, and ...

The first day of fall arrives on Sunday with the autumn equinox, starting shorter, colder days because of Earth's axis and ...

Coronal mass ejections, or CMEs, can cause both the northern lights and widespread telecommunications disruptions. But could a powerful CME end the human race?

Hong Kong’s war on plastic waste took centre stage on Earth Day on Saturday, with a green group in the city saying it was time to go beyond recycling. An eight-week programme kicked off to get ...

Editor’s Note: CNN’s 5 Things newsletter is your one-stop shop for the latest headlines and fascinating stories to start and ...

A four-person SpaceX crew returned to Earth early Sunday after the Polaris Dawn mission, which included the first private ...

A billionaire spacewalker returned to Earth with his crew on Sunday, ending a five-day trip that lifted them higher than ...

A newly discovered asteroid, also referred to as a mini-moon or second moon, is set to enter Earth's orbit temporarily this ...

It won't be there forever, but Earth will have a second moon when a small asteroid begins to orbit the planet later this ...

On World Ozone Day, we celebrate global efforts to protect and restore the ozone layer, a vital shield that protects life on ...

The autumn equinox, which comes around every September for the Northern Hemisphere, marks the official astronomical start of ...

On Sept. 14, 1959, the Soviet probe Luna 2 -- known informally as Lunik 2 -- became the first Earth-launched space vehicle to ...