Currently, most of the mass of the matter of the universe is believed to consist of
A) baryonic matter, made up of protons and neutrons.
B) tachyonic matter, travelling only faster than the speed of light.
C) dark matter not made of protons and neutrons.
D) dark energy.
E) tiny but very numerous black holes.
Question 2
What evidence from the careful examination of impact craters provides evidence that Mars had surface water long ago?
A) indistinct rims of many large craters due to water erosion
B) lack of small craters which would have been erased by ancient rainfall
C) channels where water once flowed between crater lakes
D) all of these
Brain scans showing the white-matter pathways involved in everyday learning:
Conjugate acid-base pairs consist of a proton donor and a proton acceptor
Gray matter and White matter
Diego Rivera, Man, Controller of the Universe.
Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an ...
What is the isotopic atomic mass of an isotope if 9.7023 1022 atoms weighs 4.0256 g?