1. Physics
2. Astrophysics and Atmospheric Physics
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Which of the following statements are true about time dilation?

1. Time dilation suggests that an astronaut traveling to a distant star would actually age less than we would have measured at rest on Earth

2. Time dilation can be summarized by saying that a moving clock runs slower as compared to a clock at rest

3. Time dilation can be summarized by saying that a moving clock runs faster as compared to a clock at rest

4. The proper lifetime of an unstable particle is its lifetime in the particular reference frame in which the particle is at rest

5. Due to time dilation, an unstable particle moving at very high speed will appear to us (if we are at rest) to live shorter than when the particle is at rest