Probably the supermassive black holes that are believed to be at the centers of many (perhaps most) large galaxies. These may be related to quasars.
Perhaps the most massive of all "singular" objects in the universe is a super-massive black hole.Certainly a galaxy that has many black holes in it and billions and billions of stars has more mass and more gravity than any star or smaller galaxy. But as regards "point objects" in our uinverse. The most massive black holes, the so-called super-massive black holes, are the ones with the most gravity.
A neutron star is one of the densest objects in space. They are formed when a massive star collapses and its core is compressed into a small, incredibly dense object composed mostly of neutrons. Neutron stars can have densities comparable to the density of an atomic nucleus.
The densest thing in the universe is a neutron star, which is formed when a massive star collapses in a supernova explosion. Neutron stars are incredibly dense, with a mass greater than that of the Sun packed into a sphere only about 12 miles in diameter. Their density is so extreme that a teaspoon of neutron star material would weigh billions of tons on Earth. In comparison, neutron stars are much denser than other celestial objects like white dwarfs and even black holes.
No. The densest known object in the solar system is the Italian Laser Relativity Satellite with a density of 15.85 g/cm³. There are small iron meteors that orbit the sun, and at 7-8 g/cm³, these would be the densest natural objects in the solar system. Of the major bodies in the solar system, the Earth is the densest, at 5.52 g/cm³. The density of the Sun is 1.41 g/cm³.
In theory it is compressed down into a singularity. This is why black holes are the densest objects in the universe. All that mass is being squeezed down into a single point in space.
Quasars are not actually stars, but extremely energetic and distant objects in the universe, emitting massive amounts of energy.
The theory of general relativity expands on the theory of special relativity by including gravity and describing how massive objects curve spacetime. This means that general relativity provides a more comprehensive understanding of how gravity affects the behavior of massive objects in the universe.
Everywhere in the universe. Gravitational fields are steeper and more intense around very massive objects such as stars and planets.
Objects like neutron stars and black holes have some of the highest densities in the Universe. Neutron stars are incredibly dense remnants of massive stars, while black holes have infinite density at their center known as a singularity.
Some objects that are not permanent in the universe include comets, which have highly elliptical orbits and can leave the solar system, and supernovae, which are massive explosions that mark the end of a star's life. Additionally, transient phenomena like gamma-ray bursts and gravitational waves do not have a long-lasting presence in the universe.
General relativity and Newtonian gravity differ in their explanations of the behavior of massive objects in the universe primarily in terms of the concept of space-time. Newtonian gravity describes gravity as a force acting between two objects, while general relativity views gravity as the curvature of space-time caused by the presence of mass. This leads to differences in predictions, such as the bending of light around massive objects and the existence of black holes, which are better explained by general relativity.
Galaxies are the massive collection of stars. Therefore galaxies could not have formed without stars.