Based on evidence from measurements of the acceleration of the expansion rate and from careful study of the cosmic microwave background, about what percentage of the universe's total mass and energy takes the form of ordinary atomic matter (protons, neutrons, and electrons)?
A) 5%
B) 0.5%
C) 27%
D) 68%
A) 5%
Physics & Space Science
You might also like to view...
The difference between the highest and lowest voltage of a household "120 V emf" is
A. 120 V. B. 170 V. C. 240 V. D. 340 V. E. 377 V.
Physics & Space Science
Which of the following is the centerpiece in the unified model of active galactic nuclei (AGN) and quasars?
A) A blue giant B) An accretion disk C) A torus D) A black hole
Physics & Space Science
The East African rift zone was formed by
A) two pieces of continental crust separating B) two pieces of oceanic crust colliding C) two pieces of continental crust colliding D) pieces of oceanic and continental crust colliding
Physics & Space Science
A room in a house has a floor area of 110 ft2 . Which of the following is most likely the approximate volume of the room?
a. 3 m3 b. 30 m3 c. 300 m3 d. 3 000 m3 e. 10 m3
Physics & Space Science