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There are two types of "pulsating" stars.

1. Pulsar

2. Quasar

A pulsar is actually a neutron star that is rotating at a fast rate and is releasing a jet of X-rays. So, to a special telescope, it appears to be pulsating

A quasar is similar to a pulsar, except for being a neutron star, it is a black hole.

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10y ago

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