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The team believes that the cocoon's egg-like shape could be explained by either the star's shedding or by the influence of a yet-undiscovered companion star.

In fact, nearly half of all stars similar to our sun have at least one companion star.

This black hole was spotted in data from the European Space Agency's Gaia mission because it imposes an odd 'wobbling' motion on the companion star orbiting it.

These observations revealed key properties of the companion star, which, together with Gaia data, allowed astronomers to precisely measure the mass of BH3.

It was in this data pool that the researchers spotted the strange pattern of BH3's companion star.