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In the night sky: Orion
In the night sky: Orion

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Orion Glossary

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terrestrial planet

A planet similar in size to the Earth, composed of rocky materials (cf. giant planet).

thermal pulses

Thermal pulses are brief bursts of enhanced energy production in solar mass stars due to the instabilities inherent in helium shell burning.

triple-alpha process

A sequence of nuclear fusion reactions that occurs in the cores of high-mass stars. In this sequence, three helium nuclei are converted into a carbon nucleus.