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# pulsar

«pulsar» in Mova's school dictionary: **A tiny, very heavy, spinning dead star (a neutron star)…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (a pulsar, pulsars)

### meaning for a pupil

A tiny, very heavy, spinning dead star (a neutron star) that sends out beams of radio waves or light, which reach Earth as very regular pulses, like a lighthouse. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#m1)

### sense in the lessons

In science and space lessons pulsars come up when talking about what happens after a giant star explodes in a supernova. Their pulses are so regular that scientists use them like cosmic clocks. The first pulsar was discovered by Jocelyn Bell Burnell, a student from Northern Ireland.

### examples

- A pulsar spins hundreds of times a second. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#x1)
- The pulsar's beam sweeps past Earth like a lighthouse. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#x2)
- Jocelyn Bell Burnell discovered the first pulsar. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#x3)
- At first scientists jokingly called the signal "little green men". [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#x4)
- Pulsars are left over after a supernova. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#x5)
- Some pulsars keep time better than clocks on Earth. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/#x6)

### note

Countable: a pulsar, pulsars. Comes from "pulsating star". Not the same as a quasar (a very bright centre of a faraway galaxy). A teaspoon of pulsar material would weigh millions of tonnes.

### Trees and pragmatics

[Every meaning and example of «pulsar» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pulsar/), each sentence with its dependency tree and frames.