How much longer does the Sun have to burn hydrogen to helium at its core?
A. about 500,000 years
B. about 1 billion years
C. about 1 million years
D. about 5 billion years
E. about 5 million years
Ans: D. about 5 billion years
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_________ is absorbed by water in Earth's atmosphere and requires that telescopes for observing at these wavelengths be placed on mountain tops or in space
a. Infrared radiation b. Ultraviolet radiation c. Radio wave radiation d. X-ray radiation e. Visible light
List at least two ways the sunspot cycle affects us on Earth
What will be an ideal response?
What is the distinguishing characteristic of what we call ordinary or baryonic matter?
A) It emits a great deal of light. B) It can attract other matter through the force of gravity. C) It is made of subatomic particles that scientists call WIMPs. D) It consists of atoms or ions with nuclei made from protons and neutrons.
If ? and ? are each first quadrant angles, which of the following must be true if sin ? = cos ??
a. ? + ? = ? rad b. ? + ? = 90° c. ? – ? = ?/2 rad d. ? = ?