Which events occurred during the Space race? Check all that apply.

A
development of a rover to land on Mars

B
advancements in spy satellite technology

C
design and building of an international space station

D
improved technology for sending living things into orbit

E
creation of a landing module that could fly back to the ship in orbit

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )