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What does modern science say could be done to avoid an asteroid's collision with planet earth?
Nothing can be done to alter the earth's trajectory (nor should it be done, as that would effect it's orbit around the sun) but several ideas have been presented to alter the course of an asteroid, or destroy it. One idea proposed by NASA is to attach thrusters to the surface of the asteroid and remotely guide the asteroid away from the earth. The more well supported idea is to simply blow it up with a nuclear ordinance carried by a Saturn V rocket. The concern with that idea is that neutron activated asteroid fragments might still enter the atmosphere and cause trouble. The key to either method would be early detection, as most asteroids move very quickly.
How does satellites avoid collision?
The vast majority of satellites are in geo-stationary orbits. This means, they travel around the Earth at the same speed that the Earth rotates - making them appear in the same place. One example is the GPS satellite network. Other satellites that actually orbit around the Earth, are at a different altitude - so they would (thoretically) never collide with a stationary one. Those that are orbiting, are placed in such a way, that they also avoid each other.
Why do jet planes fly above the tropopause?
Jets generally fly at or above the tropopause because below it, in the troposphere, is where all of Earth's weather occurs and it is best to avoid weather complications so they fly above it.
What are two ways in which an earthworms body is adapted to life in the soil?
When you touch a earth worm it quickly contracts and withdraws into its burrow.The earthworm has no eyes so it cannot tell that you are a bird about to eat it. Its rapid withdrawal is a behavioural adaption to avoid being eaten.
How far away is the farthest satellite?
The earth is a planet. An earth satellite is an artificial satellite that orbits the earth A geostationary satellite is an earth satellite that orbits at a height (approximately 22,000 miles) precisely determined to ensure that the satellite remains over the same spot on the earth's surface at all times, thus appearing from the earth to be stationary in the sky.
