Brown dwarfs have
A) very narrow habitable zones
B) no habitable zones
C) very wide habitable zones
D) habitable zones similar to the Sun
B
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An alloy of 80 atomic % arsenic and 20 atomic % gallium is produced, and the alloy is heated to 1250°C to thoroughly melt the mixture. The alloy is then slowly cooled so that it is always close to equilibrium. Answer the following about the alloy:
(a) At what temperature does a solid first form?
(b) What is the chemical composition of the first solid to form?
(c) Below what temperature is the alloy completely solid?
(d) At room temperature (23°C), what phases are present, what are their chemical compositions, and what is the atom fraction of each phase present?
The densest stars in the H-R diagram are the white dwarfs
Indicate whether the statement is true or false
As a star begin to form the initial energy source is from
a. nuclear fusion. b. nuclear fission. c. gravitational potential energy. d. magnetic fields.
Jovian planets are thought to form beyond the frost line of their star systems. How, then, might it be possible for a large moon around a jovian planet to have a habitable surface with liquid water?
A) The moon would need to be locked in synchronous rotation with its planet. B) The jovian planet would need to have migrated inward to the habitable zone of its star. C) The moon would need to have a magnetic field. D) The moon would need to have plate tectonics. E) The moon would need to have a high density.