- #1
LBrandt
- 63
- 0
Hello,
I’m glad that I found this forum, because there is a question that has been bothering me for some time, and maybe someone on a physics forum like this can set me straight on it. It concerns gravity and acceleration.
I understand that when an object such as a space shuttle is placed into orbit around a massive body such as the Earth, the object is actually “falling” and is able to continue its orbit because its attempt to escape orbit is matched by gravity, and it continues in a circular “fall”. I also understand that an astronaut can exit such a vehicle in orbit and that the astronaut will continue to orbit with the vehicle, without the vehicle leaving him behind.
My problem comes when I see a depiction of an astronaut exiting a spaceship that is NOT in orbit. For instance, in many movies (2001 A Space Odyssey, for example) the astronaut leaves the spaceship, and as with the astronaut exiting a vehicle in orbit, is NOT left behind by the spaceship. This same scenario has been portrayed in many sci-fi movies, not just 2001.
How can this be? If the spaceship is NOT in orbit (therefore NOT “falling”), but in fact is in interplanetary space and on a mission to Mars e.g., doesn’t the spaceship have its engines operating, and therefore how can the astronaut remain with the spaceship, when the spaceship is under rocket power and the astronaut isn’t?
Thank you,
Louis
I’m glad that I found this forum, because there is a question that has been bothering me for some time, and maybe someone on a physics forum like this can set me straight on it. It concerns gravity and acceleration.
I understand that when an object such as a space shuttle is placed into orbit around a massive body such as the Earth, the object is actually “falling” and is able to continue its orbit because its attempt to escape orbit is matched by gravity, and it continues in a circular “fall”. I also understand that an astronaut can exit such a vehicle in orbit and that the astronaut will continue to orbit with the vehicle, without the vehicle leaving him behind.
My problem comes when I see a depiction of an astronaut exiting a spaceship that is NOT in orbit. For instance, in many movies (2001 A Space Odyssey, for example) the astronaut leaves the spaceship, and as with the astronaut exiting a vehicle in orbit, is NOT left behind by the spaceship. This same scenario has been portrayed in many sci-fi movies, not just 2001.
How can this be? If the spaceship is NOT in orbit (therefore NOT “falling”), but in fact is in interplanetary space and on a mission to Mars e.g., doesn’t the spaceship have its engines operating, and therefore how can the astronaut remain with the spaceship, when the spaceship is under rocket power and the astronaut isn’t?
Thank you,
Louis