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Orbit - Wikipedia
网页Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with the center of mass being orbited at a focal point of the ellipse, [2] as described by Kepler's laws of planetary motion.
ORBIT中文(简体)翻译：剑桥词典 - Cambridge Dictionary
网页orbit. noun [ C or U ] uk / ˈɔː.bɪt / us / ˈɔːr.bɪt /. Add to word list. the curved path through which objects in space move around a planet or star. （天体围绕行星或恒星运行的）轨 …
What Is an Orbit? | NASA Space Place – NASA Science for Kids
网页4 天之前 · The Short Answer: 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!
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.
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.
Explainer: All about orbits - Science News Explores
网页2022年5月3日 · Our sun orbits the center of our galaxy, the Milky Way. Galaxies orbit each other, too. Kepler’s laws describing orbits hold true for all these objects across the universe. Let’s have a look at each of Kepler’s laws in more detail. Orbits, orbits everywhere. This image shows the orbits of 2,200 potentially hazardous asteroids orbiting the ...
Orbit | Astronomy, Physics & Mathematics | Britannica
网页orbit, in astronomy, path of a body revolving around an attracting centre of mass, as a planet around the Sun or a satellite around a planet. In the 17th century, Johannes Kepler and Isaac Newton discovered the basic physical laws governing orbits; in the 20th century, Albert Einstein’s general theory of relativity supplied a more exact ...
JPL Solar System Dynamics
网页2024年8月19日 · SSD provides information related to the orbits, physical characteristics, and discovery circumstances for most known natural bodies in our solar system. Lookup …
Chapter 3: Gravity & Mechanics - NASA Science
网页The period of the space shuttle's orbit, at say 200 kilometers, used to be about 90 minutes. Vanguard-1, by the way, has an orbital period of 134.2 minutes, with its periapsis altitude of 654 km, and apoapsis altitude of 3,969 km. Newton's thought experiment #3.