Say you (somehow) constructed a very long, sturdy rod, about a light year in length. Say it was made of unobtanium, so it has the same mass as a relatively short steel rod. Now say there are two astronauts, one at each end, and one of the astronauts gives the rod a firm push in the direction of the other astronaut.(adsbygoogle = window.adsbygoogle || []).push({});

Does the other astronaut instantaneously see the rod move in his direction? If not, how exactly does the rod behave? (Does it move at all when the astronaut pushes on it? Or does it take a really long time to start moving?)

Thanks in advance for your input on this thought problem.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Physical Interactions over Great Distances

Loading...

Similar Threads for Physical Interactions Great |
---|

I How does gravitational time dilation work? |

I Is this "warp drive" physics really possible? |

A What is the Physical Basis Of Lovelock's Theroem |

I What is the physical meaning of the Lorenz transformation? |

A General relativity package for Friedman equations |

**Physics Forums | Science Articles, Homework Help, Discussion**