Suppose the Sun had been born with more mass, making it larger and hotter. Which of the following consequences would we expect according to the nebular theory?
A) There would be no comets.
B) Asteroids would have formed closer to the Sun.
C) Jovian planets would have formed farther from the Sun.
D) There would have been no solar nebula in which material could condense to form planets.
C) Jovian planets would have formed farther from the Sun.
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You can choose between a heat pump and an electric heater to heat your house. If you assume that the electric heater is 100% efficient at turning electrical energy into heat, an electric heat pump of what coefficient of performance (COP) will result in the same cost of electricity for the same amount of heating? Assume that the motor that runs the heat pump is 100% efficient
1.0.25 2.0.5 3.1.0 4.2.0
Within the last two and a half billion years, how many snowball Earth events have occurred?
A) zero B) one C) two D) four
A(n) ______ website search provider is a third-party company that uses spiders or other tools to build a searchable index of your website's pages.
A. virtual B. hosted C. cloud D. anchor
What is a key limitation to traveling outside our Solar System in search for life? a. We have the wrong type of fuel source to power a spacecraft
b. We lack spacecraft that can escape Earth's gravity. c. We lack a decent place to send spacecraft outside of our Solar System. d. We have no way to communicate with an alien civilization. e. We have not yet been able to develop the technology to travel far distances.