A black hole could swallow the earth if one got close enough, but the actual effect a black hole would have on the planet would depend on its size. Very small black holes would have little impact if they collided with the earth, but some black holes are so large they could swallow the entire solar system.Know More
The smallest types of black holes scientists theorize exist are called primordial black holes and were formed soon after the Big Bang. While many of these small black holes evaporated long ago, those weighing more than one billion tons could still be around. According to the New Scientist, if a black hole of that size hit the earth, it would be like a magnitude-four earthquake all around the globe. The effect would be noticeable, but it would cause little destruction.
Larger black holes can range in size from stellar black holes, which have a mass ranging from three to more than 10 times that of the sun, to supermassive black holes found in the center of galaxies. The largest known black hole has a mass equal to about 6.6 billion times that of the sun and could swallow the entire solar system if it got close enough. The likelihood of any of these larger black holes getting close enough to the earth to cause any problems, however, is extremely small.Learn more about Stellar Astronomy
The reason that stars swell in size after exhausting their hydrogen cores is that the stars begin fusing helium, according to the University of Michigan. The helium releases more energy during fusion than the hydrogen releases during the process. The amount of energy produced by the helium is greater than that needed to stave off gravitational collapse, which causes the star to swell greatly in size.Full Answer >
Depending on the star's size, a supernova explosion can leave behind a neutron star, also known as a pulsar, or a black hole. A pulsar is an extremely dense ball of neutrons 10 to 20 miles in diameter that can rotate over 700 times per second. A black hole forms when a supernova remnant is so massive that no force of nature can stop its collapse.Full Answer >
Stars vary in size from less than 8 percent of the size of the sun to those with diameters of more than 1,800 times that of the sun. In terms of mass, stars must have enough mass to support the nuclear chain reaction that takes place in the core of a star, which is about 10 percent of the sun’s mass. There is also a limit to how massive starts can grow, and scientists suspect that the limit is about 150 times the mass of the sun.Full Answer >
The majority of stars are much larger than the Earth. Even the Sun, which is a relatively average star, is many times the size of the Earth. The largest star is 1,800 times as large as the Sun.Full Answer >