Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal. The name Earth is at least 1, years old. All of the planets, except for Earth, were named after Greek and Roman gods and goddesses. Go Farther. Ten Things to Know About Earth.
Earth orbits our Sun, a star. Earth is the third planet from the Sun at a distance of about 93 million miles million km. A day on Earth is 24 hours. Earth makes a complete orbit around the sun a year in Earth time in about days. Earth is a rocky planet with a solid and dynamic surface of mountains, canyons, plains and more.
Most of our planet is covered in water. Earth's atmosphere is 78 percent nitrogen, 21 percent oxygen and 1 percent other ingredients—the perfect balance to breathe and live.
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Many orbiting spacecraft study the Earth from above as a whole system—observing the atmosphere, ocean, glaciers, and the solid earth. Our atmosphere protects us from incoming meteoroids, most of which break up in our atmosphere before they can strike the surface. She did not survive the trip. A few years later, the next two Soviet space dogs—Belka and Strelka—became the first living creatures to return from space alive—paving the way for future human explorers. Pop Culture.
Storytellers explore the nature of our planet and possible alternate realities in many books, movies and television shows. The iconic Planet of the Apes film and many sequels takes place in a future in which astronauts "discover" a planet inhabited by highly intelligent apes and primitive humans, only to realize later, much to their dismay, that—spoiler alert! In the long-running and re-booted television series Battlestar Galactica , tired survivors of a war with highly evolved robots called cylons are on a quest to find Earth, a long-lost colony. In other stories, Earth has been abandoned or destroyed, such as in the Joss Whedon series Firefly or the book and its film adaptation The Hitchhiker's Guide to the Galaxy.
In the animated feature Titan A.
Kid-Friendly Earth. Our home planet Earth is a rocky, terrestrial planet.
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It has a solid and active surface with mountains, valleys, canyons, plains and so much more. Earth is special because it is an ocean planet.
Water covers 70 percent of Earth's surface. Scientists have found nearly 2, alien planets since the first such world was confirmed orbiting a sunlike star in More than half of these discoveries were made by NASA's Kepler space telescope , which launched in on a mission to determine how common Earth-like planets are throughout the Milky Way galaxy.
Kepler's observations have shown that small, rocky worlds like our own are abundant in the galaxy, and some of them may be capable of hosting life as we know it. To qualify as potentially life-friendly, a planet must be relatively small and therefore rocky and orbit in the "habitable zone" of its star, which is loosely defined as a location where water can exist in liquid form on a world's surface. When telescope technology improves, other factors will be considered as well, such as the planet's atmospheric composition and how active its parent star is.
While Earth 2. This exoplanet, which lies just 22 light-years from Earth, is at least 4.
Gliese Cc completes one orbit around its host star in a mere 28 days, but that star is a red dwarf considerably cooler than the sun, so the exoplanet is thought to lie in the habitable zone. Keplerb lies light-years away. It was the first Kepler planet found in the habitable zone of its parent star, but the world is considerably larger than Earth — about 2. It's unclear if this "super-Earth" planet is rocky, liquid or gaseous. Its orbit is about days long. Keplerc, which is about 2, light-years away, is about 70 percent larger than Earth.
So, once again, researchers are unsure about its composition. The planet completes one orbit every days, making its position within its solar system comparable to that of Venus within ours. However, Keplerc's host star is about 80 percent as luminous as the sun, so the planet appears to be in the habitable zone.
This planet is about 40 percent larger than Earth and orbits a star much cooler than our sun.