Quote by: Neil deGrasse Tyson

Most gravity has no known origin. Is it some exotic particle? Nobody knows. Is dark energy responsible for expansion of the universe? Nobody knows.

Neil deGrasse Tyson

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Related Keywords: Dark Energy Responsible Gravity Nobody Knows Most

Related Authors: Thomas Jefferson Aristotle Joseph Campbell Stephen Hawking Carl Sagan Sigmund Freud Dale Carnegie

Author Bio

  • NameNeil deGrasse Tyson
  • DescriptionAmerican astrophysicist and science communicator
  • BornOctober 5, 1958
  • CountryUnited States Of America
  • ProfessionAstrophysicist; Science Writer; Teacher; Popularizer Of Science; Cosmologist