The Edge of Space

On 11 July, 2021, Sir Richard Branson, founder of Virgin Galactic, took a suborbital flight to the inner edge of outer space, reaching an altitude of 86 km (54 miles) above the surface of the Earth. Although it marked a milestone for space tourism, where that milestone marker should be placed is an ongoing matter …

Asteroid vs Comet

From active asteroids to dormant comets, rubble piles to remnant cores, main belt comets and manx comets to ambiguous interstellar objects, this article provides a brief overview of the smaller objects in our planetary zoo—the main differences and similarities between asteroids and comets. But if it's meteors you're looking for, read Meteoroids, Meteors and Meteorites. …

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