the shortest time interval between these events?
A. Jennifer
B. Rob
C. The train passengers
A. Jennifer
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What is the maximum number of eclipses that can occur in a year?
A. 7 (four solar and three lunar) B. 4 (two solar and two lunar) C. 2 (one solar and one lunar) D. 7 (five solar and two lunar) or 7 (four solar and three lunar) E. 7 (five solar and two lunar)
Winter and summer differ in length on Mars because of its elliptical orbit
Indicate whether the statement is true or false
The tropical year is shorter than the sidereal year because Earth's
a. orbit is an ellipse rather than a true circle. b. axis precesses westward. c. orbital speed is not constant. d. axis is tilted by 23.5°.
When a star finally runs out of hydrogen to fuse in its central core
A) it grows smaller and dimmer, becoming a brown dwarf B) it grows larger and brighter, becoming a giant or supergiant star C) it grows smaller and dimmer becoming a white dwarf D) it remains the same size but grows brighter