Galaxies come in three varieties, which are

A. old, young, and intermediate.
B. Seyfert, radio, and quasar.
C. spiral, elliptical, and irregular.
D. barred spiral, irregular, and Seyfert.


Answer: C

Physics & Space Science

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Einstein's famous equation E0 = mc2 is a statement of the equivalence of energy and the square of the speed of light

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An unmarked resistor is being used in a circuit. To determine its resistance by making voltage and current measurements, one should connect

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Physics & Space Science