Astronomers have found evidence of how stars and planets form. They believe that the many tiny particles in nebulae accrete. This process starts out very slowly and gradually gets faster and
faster. What causes this to happen?
Write Y for yes next to the sentence(s) that help explain the cause; write N for no next to
those that do not help explain the cause.
Each particle gravitationally pulls on nearby particles.
A mysterious unknown force draws the particles toward each other.
Particles collide and stick together making larger particles.
The natural tendency of particles to increase in gravity makes the process speed up.
Larger particles have more mass and more gravitational attraction.
Dark energy makes the particles move toward each other and stick together.
Mi

c. is the answer

by love gaming

explanation:

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.