Observations of the cosmic background radiation from the COBE satellite revealed tiny variations in its temperature from one place to another (corresponding to a few millionths of a degree Kelvin)
Indicate whether the statement is true or false
TRUE
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How does the fraction of oxygen in Earth's atmosphere today compare to what it was 3 billion years ago?
a. It has significantly declined. b. It has significantly increased. c. It kept increasing up to 2 billion years ago but has been declining ever since. d. It hasn't changed.
By comparing the two images, what can you conclude about Io's volcanoes?
A) Every black spot in the visible image has a bright spot in the infrared image, so all of Io's volcanoes were active when the photos were taken. B) There are more black spots in the visible image than bright spots in the infrared image, so many of Io's volcanoes were inactive when the photos were taken. C) There are more bright spots in the infrared image than black spots in the visible image, so new eruptions must have started after the visible photo was taken.
The astrometric technique looks for planets with careful measurements of a star's
A) brightness. B) velocity towards or away from us. C) position in the sky. D) all of the above
The standard theory does not include which interaction?
A. electromagnetic B. gravitational C. weak D. strong E. It contains all of these choices.