Earth's orbit - Wikipedia
网页Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi), or 8.317 light-minutes, [1] in a counterclockwise direction as viewed from above the Northern Hemisphere. One complete orbit takes 365.256 days (1 sidereal year), during which time Earth has traveled 940 million km (584 million mi). [2] Ignoring the influence ...
Chapter 5: Planetary Orbits - NASA Science
网页Upon completion of this chapter you will be able to describe in general terms the characteristics of various types of planetary orbits. You will be able to describe the general concepts and advantages of geosynchronous orbits, polar orbits, walking orbits, Sun-synchronous orbits, and some requirements for achieving them.
Why aren't all orbits circular? - Live Science
网页2024年3月16日 · Astronomy. Why aren't all orbits circular? News. By Alice Sun. published 16 March 2024. Why do some celestial bodies have tadpole or even horseshoe-like orbits? When you purchase through links on...
Planet Orbits - Space Facts
网页2015年11月18日 · Orbit Lengths. In the time it takes the Earth to complete one orbit, the planets closer to the Sun (Mercury and Venus) orbit at least once. The more distant planets (Mars, Jupiter, Saturn, Uranus and Neptune) which move slower and have a greater distance to travel, complete just a fraction of their orbits in this time. Mercury.
Catalog of Earth Satellite Orbits - NASA Earth Observatory
网页The International Space Station orbits at an inclination of 51.6397 degrees to make it easier for the Space Shuttle and Russian rockets to reach it. A polar-orbiting satellite, on the other hand, gets no help from Earth’s momentum, and so …
Orbits and Kepler’s Laws - Science@NASA
网页2024年5月2日 · Kepler's three laws describe how planets orbit the Sun. They describe how (1) planets move in elliptical orbits with the Sun as a focus, (2) a planet covers the same area of space in the same amount of time no matter where it is in its orbit, and (3) a planet’s orbital period is proportional to the size of its orbit.
What Is an Orbit? (Grades 5-8) - NASA
网页2010年7月7日 · An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth or the moon. Many planets have moons that orbit them. A satellite can also be man-made, like the International Space Station.
What Is an Orbit? | NASA Space Place – NASA Science for Kids
网页6 天之前 · An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth or the Moon. Since the Earth orbits the Sun, you’re actually in orbit right now! Many planets, like Earth, have moons that orbit them.
Why Are Planets Round? | NASA Space Place – NASA Science …
网页2019年6月27日 · The Short Answer: A planet is round because of gravity. A planet's gravity pulls equally from all sides. Gravity pulls from the center to the edges like the spokes of a bicycle wheel. This makes the overall shape of a planet a sphere, which is a three-dimensional circle.
Orbit - Education | National Geographic Society
网页2024年4月4日 · An orbit is a regular, repeating path that one object takes around another object or center of gravity. Orbiting objects, which are called satellites, include planets, moons, asteroids, and artificial devices. Objects orbit each other because of gravity. Gravity is the force that exists between any two objects with mass.