How many conic sections exist in the Earth-Mars transfers?
A: Earth-centered parabola orbit
B: Sun-centered elliptical orbit
C: Earth-centered hyperbola orbit
D: Mars-centered hyperbola orbit
A: Earth-centered parabola orbit
B: Sun-centered elliptical orbit
C: Earth-centered hyperbola orbit
D: Mars-centered hyperbola orbit
举一反三
- Why is the second theory sometimes referred to as the Mars Theory A: Earth's moon used to orbit Mars. B: Mars was captured by the gravitational field of the Sun, C: A planet the size of Mars collided with Earth. D: Mars is larger than Eart
- Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use median Earth orbit satellites, BeiDou-1 uses satellites in （ ）. A: Geostationary orbit B: Circular orbit C: Sun-synchronous orbit D: Near polar orbit
- Mercury complete its orbit around the sun in only ______.
- The _______ region is centered largely in the north of the country.
- If a person weighs 68kg on Earth, about how heavy would he or she feel on Mars?