A team of European astrophysicists is suggesting that the universe could be filled with “boson stars,” which are theoretical, transparent objects made of boson particles.

If real, boson stars would share plenty of features with supermassive black holes, including the fact that “boson stars are predicted by general relativity and are able to grow to millions of solar masses and reach a very high compactness,” as research lead and astrophysicist Hector Olivares from Radboud University in the Netherlands and Goethe University in Germany told ScienceAlert.

Olivares and his team set out to calculate if boson stars would end up resembling the shadow of M87*, the first-ever photographed black hole.

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Apart from the similarities they share with supermassive black holes, boson stars would be by nature quite different from other celestial objects observed by astronomers — if they indeed exist. Bosons are an entirely different type of particle that don’t abide to the same laws that govern fermions, which are the familiar matter particles that include protons, neutrons, and electrons.

Read more: Futurism