Would like help on the conceptual questions provided below

Some Conceptual Questions about Relativity When possible, use the resources provided in class for answer the questions. The internet is not always reliable with many of these topics. Quality over quantity. Some questions require more explanation than others. Part of understanding the question is understanding how much needs to be said. 1. If an astronaut was on a spaceship that was travelling away from the Earth at 0.7 c, would they notice a change in their heartbeat. What about their mass? Height? Walstline? If you were observing them from the Earth, would you notice a change in any of those things about the astronaut? 2. What effect would If have on time dilation If the speed of light was Infinite? 3. The average human life span Is 73 years. If is possible to visit a distant planet that Is more than 73 light years away. 4. If you apply a force to an object of mass m for a really long period of time then how would Its velocity change over time? 5. If A causes B, then A must occur before B. Is It possible that A occurs before B In one frame of reference but B occurs before A In another frame of reference? (does relativity destroy the concept of causality?) 6. The woman is an astronaut. The man is her son. Explain how this could be possible