Suppose you are floating in Earth orbit. As happens in the lives of astronauts on the International Space Station (ISS).
And you have a Remington 600 rifle in your hand. It is loaded with a 300 Winchester Magnum shots.
You shot. There was no sound. Because there is no medium to spread sound waves in space.
If your fortune is good, the shot will go far. If a bullet is fired from this gun on Earth, the bullet will not go more than 1300 meters due to the friction and gravity of the wind. There is nothing to eat in space, the density of space matter is no more than a hydrogen molecule in ten square meters.
If the forehead is better, the bullet will continue according to Newton's first law, avoiding the gravitational pull of a planetary satellite. Since your bullet is moving at a speed of 1000 meters per second and the universe is expanding at a speed of about 63 kilometers per megaparse (Hubbles constant), the bullet will be able to run safely for the next 40,000 years.
If the fortunes are bad, the bullet will come under the Earth's gravity and temporarily turn into a high-speed satellite. If the forehead is genuinely cracked, that little satellite can orbit the earth and hit your back.
And what will happen to you? According to Newton's third law, you will continue to run in the opposite direction with equal speed. If you have a good fortune, you will run towards space. Oxygen will survive until Furno. If you wear NASA's current space suit, you will be able to float in space for eight and a half hours. You can cross a maximum of 10% of the way to the moon before you die.
If you are unlucky, you will fall to the earth. You will enter the atmosphere at a speed of 7.8 kilometers per second. Rubbing with you will turn the air around you into a plasma of 1850 ° C heat. After two seconds, your ashes will not be found.