Facts about universe

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01. A region near a black hole is called a photon sphere where the gravitational pull is so strong that light photons orbit it, meaning if you were at that point and turned to the side, you could see the back of your own head.

1. The Sun is so loud that if space was filled with air its sound would be 125db on Earth, 92 Million miles away. #space #science #knowledge #education #universe

1. There is a hypothetical particle called a strangelet that we might find in the cores of neutron stars. If one were to strike earth (or any object in the universe), it could turn that matter into further strangelets creating a chain reaction that would result in the Earth being turned into one big strangelet.

1. The largest known black hole (Holmberg 15A) has a diameter of 1 trillion km, more than 190 times the distance from the Sun to Pluto.