Starquake
Starquake, the sequel to Dragon’s Egg, takes place on the surface of a neutron star. The gravity is 67 billion Earth gravities. The native "cheela", the size of sesame seeds, live a million times faster than their human friends in orbit. After a starquake, the humans have only one day to save the remains of cheela civilization from extinction.
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Robert L. Forward
Robert Lull Forward (August 15, 1932 – September 21, 2002) was an American physicist and science fiction writer. His literary work was noted for its scientific credibility and use of ideas developed from his career as an aerospace engineer. He also made important contributions to gravitational wave detection research.
Dragon's Egg
Dragon's Egg consists of two books. The current recommended reading order for the series is provided below.

