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One of the largest is called ROXs 42Bb, a gas giant orbiting a star about 460 light-years from Earth. It is about nine times the mass of Jupiter and has a radius of about 2.5 that of Jupiter.

Here’s a look at five of the biggest stars ever discovered, ranked by their size, and what makes each one so fascinating. Note: This list is based on the data presented by BBC Science Focus.

Astronomers have just discovered ... the movement of stars "This particular black hole, which is roughly 30 billion times the mass of our sun, is one of the biggest ever detected and on the ...