powhound: So, nothing exceeds the speed of light in a vacuum, photons travel slower than neutrinos due to interactions in less than vacuumy interstellar space? Is that about right?My question is this: if the sun were to "disappear", would the Earth fly off instantly, or would there be a delay equivalent to the speed of light? In other words, does the gravitational force act instantly, or at the speed of light?My daughter's physics teacher asked the class that question, and argued that it is an instantaneous effect. We disagree, but there isn't much out there on the topic.
aerojockey: Mikey1969: OceanVortex: [imgs.xkcd.com image 740x232]LOL, liked that bit about the "Thought Police". That's an awesome comic. And yeah, it's a great point. Either this is going to turn out to be a mistake/error(or have a perfectly rational explanation) or it's gonna be a cool new thing to talk about. Either way, we're still gonna be able to hurt each other's feelings daily on Fark...The article writer, doing what article writers do, made the implications of this out to be more than they were. The "speed of light in a vacum" is really a theoretical limit that is never reached. We already know that light doesn't ever travel at the speed of light (even in the greatest voids of space there is still a very, very, very thin gas, but it can still be enough to slow down light a noticeable amount over a few billion years). This theory just adds another factor that can slow down light slightly.It may or may not be true but it is not at all controversial. It doesn't "disprove relativity" (apart from taking into account effects for which scientists already knew relativity doesn't hold) any more than light moving slower through a gas disproves it.
Silly_Sot: However, if your instrument is no longer sufficiently crude, then you have to start accounting for the masses of strings and friction of pulleys, which is a hassle.
czetie: Silly_Sot: However, if your instrument is no longer sufficiently crude, then you have to start accounting for the masses of strings and friction of pulleys, which is a hassle.Or as scientists like to call it, "engineering".
If you like these links, you'll love
Come for the Total, stay for the Farking.
Sign up for the Fark NotNewsletter!
Links are submitted by members of the Fark community.
When community members submit a link, they also write a custom headline for the story.
Other Farkers comment on the links. This is the number of comments. Click here to read them.
You need to create an account to submit links or post comments.
Click here to submit a link.
Also on Fark
Submit a Link »
Copyright © 1999 - 2018 Fark, Inc | Last updated: Feb 20 2018 07:22:05
Runtime: 0.352 sec (352 ms)