hydrogen and helium
Palabras clave
hydrogen,
helium,
element,
atomic,
gas,
fusion,
energy,
universe,
sun,
star,
light,
gravity,
abundance,
reactor,
balloon,
airship,
chemistry,
physics,
periodic,
table,
primeval,
stellar,
he,
reaction,
deuterium,
giant,
nebula,
core,
inflation,
astrophysics,
interstellar,
space,
discovery,
origin,
cosmic,
evolution
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