LMC X-3 is a binary system that is believed to contain a black hole
a. True
b. False
Indicate whether the statement is true or false
True
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Given that Earth's actual distance from the Sun varies by less than 3% over the course of a year, why does the diagram look so elliptical?
A) It correctly shows that Earth is closest to the Sun at points A and C and farthest at points B and D. B) The elliptical shape is an effect of perspective, since the diagram shows an almost edge-on view of a nearly circular orbit. C) The shape of the diagram is meaningless and is done only for artistic effect.
What is a particle that has no charge and resides in the nucleus of an atom?
A. Isotope B. Neutron C. Electron D. Proton
Which of these would support the capture theory of the Moon's origin?
A) the Caloris Basin on Mercury B) the retrograde orbit and large orbital inclination of Neptune's moon Triton C) the rings of all the jovians lying around their equators D) the Pluto-Charon system E) the four large moons of Jupiter orbit its equator
Electrons emitted when light strikes the surface of a metal is
a. photon emission. b. photon absorption. c. the photoelectric effect. d. a laser. e. an emission spectrum.