What key observations forced scientists to change their views about the location of the Sun within the Milky Way?
What will be an ideal response?
Answer:
- Trumpler's observations of light-absorbing matter between the open clusters.
- Observations of gas clouds in 21-centimeter line from atomic hydrogen.
- Shapley's studying of the globular clusters orbits.
You might also like to view...
What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1000 m? (The pressure inside the bathysphere is, hopefully, 1 atm.) ?sea water = 1.02 × 103 kg/m3.
A. 1.26 × 104 N B. 1.26 × 106 N C. 1.26 × 108 N D. 1.26 × 1010 N E. 1.26 × 102 N
The gold found in jewelry was made during a supernova.
Answer the following statement true (T) or false (F)
In a RLC circuit, the values of the inductance and capacitance are both doubled. In comparison with the resonance frequency of the original circuit, the new resonant frequency will be
A) the same as before. B) reduced to one-half the original value. C) reduced to one-quarter the original value. D) increased by a factor of two. E) increased by a factor of four.
An object with a mass of 10 kg is moving along a horizontal surface. At a certain point it has 40 J of kinetic energy
If the coefficient of friction between the object and the surface is 0.40, how far will the object go beyond that point before coming to a stop? Use g = 10 m/s2. A) 17 cm B) 42 cm C) 60 cm D) 5.7 cm E) 100 cm