The New Horizons space probe passed through the Pluto system in
A) 2008.
B) 2012.
C) 2015.
D) 2016.
Answer: A
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What is the key distinction between protostars and true (main-sequence) stars?
A) Protostars generate most of their energy from gravitational contraction, and stars generate it from nuclear fusion. B) Protostars are larger and more luminous than stars. C) Protostars have stronger magnetic fields than stars. D) Protostars are supported by thermal pressure, and stars are supported by degeneracy pressure.
The parallax shift of a nearby star would be ________ that of a more distant star.
A. greater than B. brighter than C. the same as D. faster than E. less than
A cylinder of radius 8.0 cm rolls 20 cm in 5.0 s without slipping. Through how many degrees does the cylinder turn during this time?
What will be an ideal response?
How do humans use their eyes to measure relative distance by parallax?
a. By continuously focusing our eyes on distant objects, we can determine distance. b. Since our eyes are separated, the brain interprets the relative look angles of these eyes in terms of distance to the object viewed. c. Our eyes can measure the time it takes light to travel from an object and from this we get distance. d. By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.