Directions: Click on the correct answers. Which of the following phenomena would be associated with the Big Bang Theory?
The universe is contracting
Hot, expanding matter eventually condensed into galaxies.
The universe began as a cool massive star.
Cool, expanding matter eventually heated and became suns.
The universe began in a hot dense state.
The universe is expanding.

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.

yes the answer is total mass in unchanged   : )