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Spiral galaxies are mostly found in low-density regions of the Universe (i.e. with not many other galaxies nearby) and it is rare to find them in the middle of galaxy clusters. Our own galaxy, the Milky Way, is thought to be a spiral galaxy with a central bar feature. WhatRead More →

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Dark nebulae are interstellar clouds that contain a very high concentration of dust. This allows them to scatter and absorb all incident optical light, making them completely opaque at visible wavelengths. Why is the Horsehead Nebula pink? The Horsehead Nebula, a complex of gas and dust 1500 light years awayRead More →