Andromeda Galaxy -- The most famous of all galaxies is also the most distant object visible to the naked eye, and the nearest major galaxy to our Milky Way. In some ways its spiral structure resembles that of our own galaxy, but it is about twice as massive. The galaxy is most visible in the northern sky towards the end of autumn and beginning of winter. Andromeda's proximity will be deadly to our galaxy. Astronomers estimate that it will collide with the Milky Way in about 5 billion years.
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NGC 602 is a young, bright open cluster of stars located in the Small Magellanic Cloud (SMC), a satellite galaxy to the Milky Way. Radiation and shock waves from the stars have pushed away much of the lighter surrounding gas and dust that compose the nebula known as N90, and this in turn has triggered new star formation in the ridges (or "elephant trunks") of the nebula.