| 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. 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. 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.
Origin Early 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. 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).
Origin Early 20th century: from planet, on the pattern of infinitesimal. |