The name of which astronomer is most closely linked with that of Henry Russell?
a. Henrietta Leavitt
b. Johannes Kepler
c. Ejnar Hertzsprung
d. Edwin Hubble
c
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A crater of the correct age to be from the impact thought to have caused the extinction of the dinosaurs was found in
A) the Yucatán Peninsula in Mexico. B) Arizona. C) Northern Africa. D) Chelyabinsk, Russia. E) Tunguska, Siberia.
At what rate is power supplied by the 10-V emf shown below?
A. ?10 W B. +10 W C. zero D. +20 W E. ?20 W
A(n)__________is a sensitive astronomical instrument that measures the brightness of individual objects very precisely
A) photometer B) grating C) charge-coupled device D) array detector
The Universe contains _____________________
a. 22.7% baryonic, 4.5% WIMPs, 72.8% dark energy b. 22.7% normal, 4.5% non-Baryonic, 72.8% dark energy c. 22.7% non-Baryonic, 4.5% normal, 72.8% dark energy d. 22.7% dark energy, 4.5% baryonic, 72.8% non-baryonic