The black hole depicted in the movie Interstellar, named Gargantua, is a fictional representation created for the purpose of storytelling and visual effects. While Gargantua was visually stunning and portrayed as an incredibly massive and massive black hole, it is not based on scientific accuracy.
In reality, black holes can come in various sizes and masses, depending on the amount of mass they have acquired. A black hole's mass is concentrated within its event horizon, which is the boundary beyond which nothing, not even light, can escape its gravitational pull.
The size and mass of a black hole are determined by the amount of mass that collapsed to form it. Stellar black holes, which form from the collapse of massive stars, can have masses ranging from a few times that of the Sun to several tens of times larger. Supermassive black holes, found at the centers of galaxies, can have masses millions or even billions of times greater than that of the Sun.
While the exact upper limit of a black hole's mass is not well defined, there are theoretical constraints and observational limits based on our current understanding of astrophysics. The largest black holes observed to date are supermassive black holes, with masses on the order of billions of solar masses.
To the best of our scientific knowledge, black holes with masses and sizes comparable to Gargantua from Interstellar are not considered possible. The extreme size and mass depicted in the movie would present significant challenges to our current understanding of black hole physics and the physical laws governing the universe.
It's worth noting that the portrayal of Gargantua in Interstellar was intended to create a visually captivating representation of a black hole, rather than being scientifically accurate. The movie took artistic liberties for dramatic effect, and the depiction of the black hole does not reflect our current understanding of astrophysics and black hole science.