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Nebulae

<< 8/12 < > Collision of two gasses ("cometary knots") in the Helix Nebula in the constellation Aquarius This colorful image from the Hubble Space Telescope shows the collision of two gases near a dying star. Astronomers have dubbed the tadpole-like objects in the upper right-hand corner "cometary knots" because their glowing heads and gossamer tails resemble comets. Although astronomers have seen gaseous knots through ground-based telescopes, they have never seen so many in a single nebula. Credit: Robert O'Dell, Kerry P. Handron (Rice University, Houston, Texas) and NASA

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