planetesimal

«planetesimal» in Mova's school dictionary: a small solid lump of rock, dust or ice, from a few… — its meaning for a pupil, its sense in the lessons and examples.

part of speech

noun (a planetesimal, planetesimals)

meaning for a pupil

A planetesimal is a small solid lump of rock, dust or ice, from a few metres to a few kilometres across, that moved around a young star; scientists think many of them crashed and stuck together to build planets. tree →

sense in the lessons

In space science lessons it explains how the planets of our Solar System formed about 4.6 billion years ago; asteroids and comets are thought to be leftover planetesimals. Phrases: dust grows into planetesimals.

examples

• Planets formed from millions of planetesimals. tree →
• A planetesimal is like a building block of a planet. tree →
• Some asteroids may be leftover planetesimals. tree →
• The planetesimals bumped and stuck together. tree →
• Scientists study planetesimals to learn how Earth formed. tree →
• Earth may have grown from planetesimals crashing together. tree →

note

Countable. Say plan-uh-TES-im-ul. Built from «planet» and «infinitesimal» (very tiny). An advanced science word; «building blocks of planets» is a simple way to explain it.

Trees and pragmatics

Every meaning and example of «planetesimal» parsed by Mova, each sentence with its dependency tree and frames.