Some people wish that we lived in a recollapsing universe that would eventually stop expanding and start contracting. For this to be the case, which of the following would have to be true (based on current understanding)?
A) Dark energy is the dominant form of energy in the cosmos.
B) Dark energy does not exist and there is much more dark matter than we are aware of to date.
C) Neither dark energy nor dark matter really exist.
D) Dark energy exists but dark matter does not.
Question 2
Which of the following statements about scientific theories is false?
A) Theories are not taken seriously if they contradict older, more developed, theories.
B) A theory is a model designed to explain a number of observed facts.
C) If even a single new fact is discovered that contradicts what we expect according to a particular theory, then the theory must be revised or discarded.
D) A theory must make predictions that can be checked by observation or experiment.
E) A theory can never be proved beyond all doubt; we can only hope to collect more and more evidence that might support it.
One target for expanding medical services involves vaccinations. Only 78 percent of children ages 19 ...
Homeless people sleeping on the streets is a common sight in India’s cities. I took this photo in ...
Where do you think these people fit in Gans’ classification of urban dwellers?
Prevalence of drug use in the United States. Figures are based on a survey of people 12 years of age ...
A certain car traveling at 34.0 mph skids to a stop in 29 meters from the point where the ...
People with Huntington disease develop problems with neuromuscular control and gradually lose the us