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What exactly is propelling Voyager through interstellar space?
by optimusprinceps 12y ago
What exactly is propelling Voyager through interstellar space?
- chton 12y agoThe speed it already has. There's practically no friction in space, so any speed it picked up from its engines and gravitational slingshots is kept. Newton's first law.
- batbomb 12y agoand 30 years of any radiation pressure.
- chton 12y agothat's a good point. It's impossible to measure the effect of this on the Voyagers because they still constantly fire attitude control thrusters to align themselves to earth. The noise on the speed from those firings is too much to distinguish solar radiation pressure.
- astrodust 12y agoActually they can measure this with great precision. Consider how they were able to isolate the "Pioneer Anomaly" (http://en.wikipedia.org/wiki/Pioneer_anomaly http://en.wikipedia.org/wiki/Pioneer_anomaly), an extremely tiny amount of deceleration caused by radiation from the reactor. If they can measure the drag caused by radiation, you can bet they can account for solar effects. Also worth noting: The thrusters are fired very infrequently. According to that page, the Voyager missions required constant adjustments but the Pioneer system is spin stabilized.
- chton 12y agoThat's exactly the problem. Because Pioneer was spin-stabilized, it didn't need to fire thrusters, so the noise wasn't there and the anomaly could be measured. Voyagers aren't spin-stabilized, so they have to fire thrusters quite frequently. That makes it impossible to measure a small enough effect on them.
- alphydan 12y agoNothing, it's just momentum (or newton's first law of motion, https://en.wikipedia.org/wiki/Newton's_laws_of_motion https://en.wikipedia.org/wiki/Newton's_laws_of_motion)