Portal:Astronomy/Picture/Week 01 2006
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Mz3, also known as the Ant Nebula, is a very elongated planetary nebula, formed by gas being ejected from a dying star. The cause of its bipolar shape is not known: magnetic fields, a binary star at the centre of the nebula or interacting stellar winds may all be partly responsible. Credit: NASA, ESA and the Hubble Heritage Team .