| 释义 |
Definition of planetesimal in English: planetesimalnoun ˌplanɪˈtɛsɪm(ə)lˌplanəˈtesəməl Astronomy A minute planet; a body which could come together with many others under gravitation to form a planet. 星子 Example sentencesExamples - Asteroids are small bodies in space - the numerous leftover planetesimals from which the planets were made nearly 4.6 billion years ago.
- As planetesimals grow still larger, their gravitational attraction increases, allowing them to become even more effective at accreting nearby planetesimals.
- When the planets formed 4.6 billion years ago, they formed from an agglomeration of many planetesimals, or small solid celestial bodies.
- Although planets, moons and planetesimals may seem to be very different astronomically, their common origin shows that this is not so.
- Like the hills and valleys on a contour map the gravity wells of suns, planets, moons, and planetesimals showed up.
adjective ˌplanɪˈtɛsɪm(ə)lˌplanəˈtesəməl Astronomy Denoting or relating to planetesimals. 星子的 the planetesimal material orbiting the sun Example sentencesExamples - His greatest contribution, however, was his planetesimal hypothesis of the origin of the planets.
- Models of planetesimal disks suggest that low relative velocities between the bodies produce accretion (objects hit and stay together) rather than fragmentation (objects break up and disperse).
- After all, planetesimal sized portions of the Solar System cannot be considered to be orbiting the Earth, except in the obvious case of the Moon.
OriginEarly 20th century: from planet, on the pattern of infinitesimal. Definition of planetesimal in US English: planetesimalnounˌplanəˈtesəməl Astronomy A minute planet; a body that could or did come together with many others under gravitation to form a planet. 星子 Example sentencesExamples - As planetesimals grow still larger, their gravitational attraction increases, allowing them to become even more effective at accreting nearby planetesimals.
- When the planets formed 4.6 billion years ago, they formed from an agglomeration of many planetesimals, or small solid celestial bodies.
- Asteroids are small bodies in space - the numerous leftover planetesimals from which the planets were made nearly 4.6 billion years ago.
- Although planets, moons and planetesimals may seem to be very different astronomically, their common origin shows that this is not so.
- Like the hills and valleys on a contour map the gravity wells of suns, planets, moons, and planetesimals showed up.
adjectiveˌplanəˈtesəməl Astronomy attributive Relating to planetesimal bodies. the planetesimal material orbiting the sun Example sentencesExamples - After all, planetesimal sized portions of the Solar System cannot be considered to be orbiting the Earth, except in the obvious case of the Moon.
- His greatest contribution, however, was his planetesimal hypothesis of the origin of the planets.
- Models of planetesimal disks suggest that low relative velocities between the bodies produce accretion (objects hit and stay together) rather than fragmentation (objects break up and disperse).
OriginEarly 20th century: from planet, on the pattern of infinitesimal. |