Astronomers recently detected a stray quasi-moon in our planet’s orbit, but it's hardly the first stowaway to hang out around Earth.

The asteroids are as large as around 75 and 91 feet in diameter, according to the Center for Near Earth Object Studies.

Simulations and satellite data reveal that Earth's magnetic field is more complex than scientists had thought. Scientists studying Earth's magnetic field have discovered that its electric heartbeat flows in the opposite direction from what long-standing models predict.

A lone man walks across an expanse of ice; a mottled tundra; desert badlands. The single human figure becomes a focal point as images from Earth’s diverse ecosystems change underfoot. In this visual lies a metaphor: Human footprints have made their way across the entire planet, but how have they actually shaped the land?

The sun has burped out bursts of energy called coronal mass ejections that could reach Earth Tuesday night. Forecasters said the vibrant displays could be visible across much of the northern U.S.

Scientists have discovered a fern from South China that naturally forms tiny crystals containing rare earth elements (REEs). This breakthrough opens the door to a promising new way of "green mining" of these minerals called phytomining.

The US and China are still negotiating over the key details of how Beijing will free up sales of rare earths, according to a person familiar with the matter, weeks after a trade truce that Washington said would pave the way for increased exports.

" Alien: Earth" arrived on FX and Hulu on August 12 and has emerged as a smash hit for creator Noah Hawley. The series not only adapted well-known facts in the "Alien" franchise, but brought the threat of Xenomorphs to Earth for the very first time.

The Jeff Bezos-backed Blue Origin now rivals SpaceX after successfully recalling its reusable booster after launching the New Glenn rocket.