E A R T H Earth›s circumference: is the distance around Earth. Measured around the Equator, it is 40,075.017 km (24,901.461 mi).

Earth Our home planet Earth is the only planet known to support life. It offers liquid water, an oxygenrich atmosphere, and protection from the Sun’s harmful radiation

Earth›s circumference: is the distance around Earth. Measured around the Equator, it is 40,075.017 km (24,901.461 mi).

The Only Home We Have Of all the beautiful images humans and robotic spacecraft have captured while exploring our solar system, perhaps none are more powerful than pictures of Earth. It can be profound and humbling to see our planet from deep space, as Planetary Society co-founder Carl Sagan eloquently explained in his 1994 book “Pale Blue Dot.”

Astronauts who travel to space experience what is known as the “overview effect” upon seeing Earth from afar. They often return home feeling a deep responsibility to preserve and cherish our planet. We know of no other habitable worlds like Earth, nor do we currently have the technology to terraform a world like Mars to make it Earth-like.

Planetary Defense

Space is vast, but it’s not empty. Small grains ,of space dust bombard Earth daily burning up as meteors in our atmosphere. Some become meteorites that survive all the way to the ground. And occasionally, larger objects strike the planet, causing local .or even global destruction Sixty-six million years ago, a large asteroid impact wiped out three-quarters of all life on Earth, including the dinosaurs. Large impacts are relatively rare, but under 20 the right circumstances an object just meters wide could destroy an entire city

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