If you are interested in the colors of planets, you may also want to check out the color of plants on other worlds and the planetsâ true colors. Astronomy Cast has episodes on all of the planets, so start with Mercury and listen to all of them.
No, a human couldn't live without a brain because the brain controls everything in your body, so it tells your heart to beat, feet to move, eyes to blink, mouth to open, teeth to chew. If you don't have your brain to tell your heart to beat, your heart cannot pump blood. So your body really can't live.
Originally Answered: How long can a person live without a heartbeat? The heartbeat is the sound the heart valves' closing makes as the heart contracts and pushes oxygenated blood out to the aorta to supply oxygen to the body and deoxygenated blood to the pulmonary artery into the lungs to pick up more oxygen. The brain can survive for 4 minutes without oxygen, then brain cells start dying. So if there is no heartbeat, the heart is not contracting, the blood is not circulating through the body, and there is no oxygen supply. Other tissues and organs can live longer without oxygen. For example an arm or leg can survive up to 6 hours. That is why if there is a deep cut or wound, a tourniquet can be applied to stop the flow of blood to a limb for several hours if needed.