What is this a picture of?

A) a cluster of galaxies
B) a globular cluster
C) an elliptical galaxy
D) the expanding universe


A) a cluster of galaxies

Physics & Space Science

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A bar of diameter d 5 18 mm and length L 5 0.75 m is loaded in tension by forces P. The bar has modulus E 5 45 GPa and allowable normal stress of 180 MPa. The elongation of the bar must not exceed 2.7 mm. The allowable value of forces P is approximately:


(A) 41 kN
(B) 46 kN
(C) 56 kN
(D) 63 kN

Physics & Space Science

During which stage of planetary development did the lunar maria form?

a. cratering b. differentiation c. flooding d. tectonic plate movement e. slow surface evolution

Physics & Space Science

Velocity Addition: A spaceship is moving in a straight line away from Earth at 0.80c, measured relative to Earth. It launches a missile that moves away from the spaceship in the forward direction at 0.60c, relative to the ship. Relative to Earth, what is the speed of this missile?

A. greater than 0.80c but less than c B. 1.4 c C. c D. greater than c but less than 1.4c

Physics & Space Science

Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 65 km/s/Mpc

How fast would a galaxy located 500 megaparsecs distant be receding from us? A) 65 km/s B) 65 Mpc/s C) 32,500 km/s D) 9 km/s E) 0.65 times the speed of light

Physics & Space Science