No, it’s not dark matter.
Gravity is the force that attracts objects toward the Earth and maintains the orbital motion of planets around the Sun. Our scientific understanding of gravity was established by Isaac Newton.
Despite the many successes of Einstein’s theory of gravity, many phenomena, such as gravity inside a black hole and gravitational waves, can’t be explained.
Tod Strohmayer (GSFC), CXC, NASA — Illustration: Dana Berry (CXC)
Our scientific understanding of gravity was established by Isaac Newton in 1687. Newton’s theory of gravity stood the test of time for two centuries until Albert Einstein proposed his ‘General Theory of Relativity,’ filling in the gaps left by Newton’s theory of gravity.
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