What role do molecules play in spectral classification?
What will be an ideal response?
Molecules can only form at temperatures of type M stars, not in hotter ones.
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Thermal Expansion: A steel bridge is 1000 m long at -20°C in winter. What is the change in length when the temperature rises to 40°C in summer? The average coefficient of linear expansion of this steel is 11 × 10-6 K-1.
A. 0.33 m B. 0.44 m C. 0.55 m D. 0.66 m
The electric potential inside a charged solid spherical conductor in equilibrium
a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e. is equal to the charge passing through the surface per unit time divided by the resistance.
As with our own Sun among the neighboring stars, most galaxies in the Local Group are smaller and dimmer than our own Milky Way
Indicate whether the statement is true or false
Based on current evidence, a supercluster is most likely to have formed in regions of space where ________
A) the acceleration of the expansion was proceeding faster than elsewhere B) the density of dark matter was slightly higher than average when the universe was very young C) supermassive black holes were present in the very early universe D) there was an excess concentration of hydrogen gas when the universe was very young