Which of the following is not a major idea of Einstein's general theory of relativity?
A) It is possible to travel through wormholes.
B) Time runs slower near strong gravitational fields.
C) Our universe can have no center or boundaries, yet be finite.
D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe.
E) Large masses that undergo rapid changes in motion or structure can emit gravitational waves that travel at the speed of light.
A) It is possible to travel through wormholes.
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Process of Science: A scientific theory must produce testable hypotheses that are then evaluated when data are available
What testable hypotheses does nebular theory predict? Describe two hypotheses about solar systems that come from nebular theory that we can test when more data on other solar systems become available.
An object is moving with constant velocity. Which of the following statements is true?
A) A constant force is being applied in the direction of motion. B) A constant force is being applied in the direction opposite of motion. C) There are no forces acting on the object. D) The net force on the object is zero. E) There is no frictional force acting on the object.
A parsec is about 3.3 light-years
Indicate whether the statement is true or false
Good tracers of the spiral tracers are all I. very old. II. very young. III. very luminous. IV. moving with large radial velocities
a. I & III b. I & IV c. II & III d. II & IV e. I, III, & IV