Why do astronauts' weights differ in space? There is a less gravitational force in space.
Their mass changes in space.
Space is colder than Earth.
There is less oxygen in space.

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.

Hi , i am new here can anyone me out with this question why is space black after having so many shining objects like sun , moon , stars