Space Daily August 21, 2026 • 13:30

Earth’s atmosphere does not end anywhere near the edge of space: a ghostly hydrogen cloud called the geocorona stretches 630,000 kilometres out — far enough to envelop the Moon and make every lunar mission, technically, a journey through the outermo - Space Daily

SOHO traced Earth's neutral-hydrogen geocorona beyond the Moon, but its density at lunar distance is only about 0.2 atom per cubic centimetre.

There is no altitude at which Earth’s atmosphere simply stops. The blue sky becomes black, aircraft lose the ability to fly and orbital motion takes over, but a vanishingly thin population of particl… [+10079 chars]

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Earth’s atmosphere does not end anywhere near the edge of space: a ghostly hydrogen cloud called the geocorona stretches 630,000 kilometres out — far enough to envelop the Moon and make every lunar mission, technically, a journey through the outermo - Space Daily

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