Interstellar bubble #N44F | In this unusual image, Hubble Space Telescope captures a rare view of the celestial equivalent of a geode — a gas cavity carved by the stellar wind and intense ultraviolet radiation from a hot young star.
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Hubble observations over the past 2 decades have revealed an huge complexity and diversity of structure in planetary nebulae. This is an X-ray/optical composite image of the Cat’s Eye Nebula (NGC 6543). Image via HST’S Greatest Hit
Spiral galaxies are eating their dwarf galaxy brethren all across the universe
Smaller satellite galaxies caught by a spiral galaxy are distorted into elongated structures consisting of stars, which are known as tidal streams, as shown in this artist's impression. The new survey has, for the first time, shown the presence of such te