12. Which is a highly dense body that was once a star and has an extremely strong gravitational field? a. black hole - 13. b. galaxy c. nebula What can't the solar nebular disk models explain? a. the occurrence of black holes b. the ages of Earth and the Moon c. the formation of the nebular disk d. red giant e. a. Earth b. Jupiter c. Mars 15. Which of the following is not a planet? a. Mars b. Mercury Pluto d. the existence of gas and dust clouds e. the observed orbit of the planets along the same plane 14. Which of the following is not a terrestrial planet? C. supernova d. Mercury e. Venus d. Saturn e. Uranus

Q: please highlight the correct answer

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