Black holes are celestial objects which are so dense, that not even light can escape they intense gravitational pull. Their gravity is not sufficient to overpower the atomic and nuclear forces of their interiors, which resist compression. But in more massive objects, gravity ultimately wins. This phenomenon occurs when a dying stars runs out of fuel and collapses under the weight of their own gravity. According to scientists, there might be three types of black holes : stellar, supermassive, and miniature black holes – depending on their mass. Astronomers can measure the mass of black holes by studying the material that orbits around them.
Apophis previously known as 2004 MN4, a member of the Aten group of near-Earth asteroids which had been estimated by NASA as having a 1 in 5500 chance of striking the Earth in 2029. Concealing the energy of 65,000 atomic bombs asteroid Apophis with a mass of 50 million tonnes and a diameter of 320 meters will cross the orbit of the moon and rush to the Earth with a speed of 45 thousand miles per hour. In a collision of Apophis might do unseen troubles.
The universe’s expansion is accelerating, an observation that prompted astronomers to invoke an unknown entity called dark energy to explain it, has been further confirmed by new measurements. Scientists have used cosmic magnifying glasses called gravitational lenses to observe super-bright distant galaxies, giving a measure of how quickly the universe is blowing up like a giant balloon. They found, in agreement with previous measurements, that the universe’s expansion is indeed speeding up over time.
New video of Jupiter are the first to catch an invisible wave shaking up Jupiter’s jet streams, an interaction that also takes place in Earth’s atmosphere and influences the weather. The video, made from images taken by NASA’s Cassini spacecraft when it flew by Jupiter in 2000, are part of an in-depth study conducted by a team of scientists and amateur astronomers led by Amy Simon-Miller at NASA’s Goddard Space Flight Center in Greenbelt, Md..
A team of American and Spanish astronomers led by Warren Brown from Harvard University in the United States found two white dwarf that form a binary system J0651, at a distance of 3.26 thousand light-years from Earth, and that should be a powerful source of gravitational waves. One of the stars of J0651 is with the size of Neptune and the mass of a quarter of a solar mass, the second is with the size of the Earth and the solar mass in the half.
NASA’s Gravity Probe B (GP-B) mission has confirmed two key predictions from Albert Einstein’s general theory of relativity, which the spacecraft was designed to test.