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1- Neutron star --- The dense remains of a star

2- Nebula --- A large mass of gas and dust

3- Supernova --- An explosion of a star

Explanation:

1- A neutron star is a type of stellar remnant resulting from the gravitational collapse of a massive supergiant star after exhausting the fuel in its core and exploding as a supernova. As the name suggests, these stars are composed mainly of neutrons.

2- Nebulae are regions of the interstellar medium constituted by gases (mainly hydrogen and helium) as well as chemical elements in the form of cosmic dust.

3- A supernova is a stellar explosion that can manifest itself in a very remarkable way, even to the naked eye, in places on the celestial sphere where previously nothing had been detected in particular.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.