Continuing our top 10 ranges, today we will write about top 10 largest cities in the world by land area.
According to new research when two city-size neutron stars collide the resulting shockwave emits radio signals that can help astronomers to verify elusive gravity waves. Superdense neutron stars form when a supernova collapses in on itself to the point where its protons and electrons merge to form neutrons. The resulting stars contain a mass equivalent to our sun, but packed into an ultra-small space about 12 miles (nearly 20 kilometers) across, a teaspoon of the material can weigh up to 6 billion tons. According to Tsvi Piran, of the Hebrew University in Israel, binary collisions are very rare, but they are very important because they are the best sources of gravitational radiation.
As part of his theory of general relativity, Albert Einstein predicted the existence of gravity waves in 1916. The presence of high mass objects causes space-time to warp in a way that we see as gravity. But when large masses, such as two dense neutron stars, move suddenly, their motion can also cause a shift in space-time. Sensitive telescopes such as LIGO in Louisiana and LOFAR in the Netherlands, both under construction, will be able to detect the minute changes caused by these waves.
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