Section 2d
Distance to the sun is a factor that affects the......of the seasons.
lengths
1st satellite launched by the U.S.
Explorer 1
China
1st Chinese astronaut
Yang Liwei
What maneuver allows a spacecraft to steal a planet's motion, thus increasing its speed and orbit as it flies past?
gravity assist
The unit of time, larger than a day, that is not based on the motion of a heavenly body is the....
week
1st space station designed so that it could be expanded
Mir
1st type of spacecraft designed to be reused
Father of Modern Rocketry
Robert Goddard
In which type of orbit does a satellite cross the equator at the same local mean solar time on every orbit?
sun-synchronous orbit
The 2 points at which the apparent path of the sun crosses the celestial equator are called....
equinoxes
1st space station launched by the U.S.
Skylab
1st artificial object to orbit the earth
Sputnik 1
1st human being to set foot on the moon
Neil Armstrong
What orbit is the most fuel-efficient way for a spacecraft to move between orbits?
Hohmann transfer orbit
The abbreviation A.D. stands for....
anno domini
1st mission to land a man on the moon
Apollo 11
1st person to travel in space
Yuri Gagarin
rocket that uses various combinations of LIQUID chemicals that expand greatly when they react with each other
liquid-fuel rocket
What type of orbit is perpendicular to the equator?
polar orbit
The sun's northernmost and southernmost points on the ecliptic are called...
solstices
1st space station launched
Salyut 1
1st American to orbit the earth
John Glenn
Any activity performed by an astronaut outside a spacecraft
EVA
What term refers to the lowest point in the orbit of an earth-orbiting satellite?
perigee