__________ help astronauts to travel to space from Earth.
To an astronaut in a space -ship, the earth appears :
(a) white (b) red
(c) blue (d) black
The international space station is maintained in a nearly circular orbit with a mean altitude of 330 km and a maximum of 410 km. An astronaut is floating in the space station’s cabin. The acceleration of astronaut as measured from the earth is.