What is the largest mass (planet/astroid/star etc) that we know of in the Universe?
It depends what you mean by ‘mass’ and ‘largest’. Arguably the largest and most massive known structure in the Universe (smaller than the Universe itself) is the Sculptor Supercluster. Galactic superclusters are the largest and most massive types of structures smaller than the Universe, and the Sculptor Supercluster is possibly the largest known supercluster at about 250 million light years across (that’s about 15.8 trillion times the distance from the Earth to the Sun). However, it is not a solid object, in fact it is far less dense, overall, even than the ’empty space’ inside our own solar system. The largest known solid object, measured in sheer volume, is a star called VY Canis Majoris, located about 5000 light years away from the Sun. It is about 2000 times as wide as the Sun, meaning that if it were in place of the Sun, its outer edge would extend past the orbit of Saturn. However, it is far less dense than the Sun, and weighs in at only a few hundred solar masses. The most massi
