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Is it possible for lifeforms to exist in the Andromeda galaxy (M31)? If there is, why haven't we found them yet?

How can the universe is a sphere that you cannot get outside the universe because you would still remain in it, and if it expanding the speed of light there suppose to be an outside. This don't make sense.

What would happen to Earth if an Asteroid the same size or bigger than Earth went towards it? would it destroy the planet?

I got the Prime 250mL bottle and i wonder how much should i be putting in a 20 gallon fish aquarium. The directions says use 1 capful (5mL) for each 200 L (50 gallons) of new water. For smaller volumes, please note each cap thread is approx. 1mL). I also use a 5 gallon bucket of new water to change. How much should i be adding in the cap for these two?

Is it possible if there was another universe that exist

Asteroid, Comet? Or was the explosion caused by Aliens spacecraft, Extraterrestrial begins from outer space or even a alien weapon.

There must be something above the universe even if its a flat or closed universe. Earth is a sphere and round shape and once we travel above earth it is space. The same as the universe, even if you go up it goes somewhere. Don't ask that there will be more space because it it's not possible because we don't know the answer.

We have always known there was something special about planet Mars. Mars was maybe once a livable planet before. There are strange things that are photographed on mars, ruins, markings, water, ice. People have found fossils of organisms in rocks from mars. Mars might have living creatures before, true or not. But we do not have evidence of life in mars. Mars somehow became a dry desert.

I believe there are another universe outside of our universe.

Will it cause another big bang or keep expanding into endless nothingness forever.

Before pouring it into the tank or waiting for a minute or hour after adding water conditioner.

To remove chlorine: 5 mL treats 38 L (10 U.S. gal) To remove chloramine: 10 mL treats 38 L (10 U.S. gal) To protect scales & fins: 10 mL treats 38 L (10 U.S. gal).

I have a 23 gallon fish tank (90 Liters). How much should i be adding?

I heard maybe they traveled the speed of light to get here or went into black holes, wormholes. They actually might be time travelers from the future. Albert Einstein's Theory of Relativity says it is possible, Say that a person sitting in a spaceship that is travelling near the speed of light time will become slow and he would be going into the future.

They claim those grey aliens are from a star called Zeta Reticuli which is 39.17 light years away from earth. I heard from interviews that people that worked at area 51. His name was bob lazar or robert lazar.

I don't necessarily think that God wouldn't allow for time travel and here's why. I don't think God would allow us to change anything because time travel into the past would be impossible anyway due to creating a time paradox and therefore impossible. Once to traveled to the future you wouldn't be able to travel back to the present. While He is outside of any dimensions, we humans unfortunately are not - incidently for there to be no change, you'd have to move at the speed of light; we are no where near this capabibility presently.

Or was there life before earth was created and they are dead and that's why we haven't found them yet.

do you have to wait 24 hour before adding the water?

I don't get it. Can you travel back in time since the beginning of the universe or before?

What existed before it? and who created it? and how can something just always exist? there has to be someone who "births" it. Not saying its god but more along the lines of something isn't created from nothing and some unknown force of which i don't have any knowledge of must have created it.

Do anything happen or will it expand into endless nothingness