to form long-lived stars, such as the Sun.

Abundance

Deuterium occurs in trace amounts naturally as deuterium gas (H or D), but most deuterium in the Universe is bonded with H to form a gas called hydrogen deuteride (HD or HH). Similarly, natural water contains deuterated molecules, almost all as semiheavy water HDO with only one deuterium.

The existence of deuterium on

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