What is outside the observable universe? It it more stars and planets? Or nothing? |
- What is outside the observable universe? It it more stars and planets? Or nothing?
- How well mapped is the inner solar system, resolution-wise? Like, it's safe to say we know about all objects bigger than ??? meters across? What organizations maintain lists of known objects in space?
- How can black hole post-merger ringdowns occur if the No-hair Theorem is true?
- If we could travel at the speed of light, would it ever be safe to travel through deep space?
- When does slang become a dialect?
- How does the Doppler effect work at relativistic speeds?
- Why is Kepler's emergency mode fuel intensive? What is Kepler doing?
- Why wouldn't my friend's idea for "free energy" work?
- Is the hearing protection with in-ear buds combined with over ear muffs simply the sum of each db value?
- How much do bodies/coffins move/settle within the ground if the cemetery is located on a hill. Do they move towards the bottom?
- Photonic Laser Thruster - does photon energy diminish?
- What does it mean in physics when something is said to have an "energy level"?
- Does gravity affect the speed of gravity?
- Can acceleration change instantaniously, or is it continuous?
| What is outside the observable universe? It it more stars and planets? Or nothing? Posted: 11 Apr 2016 06:35 PM PDT |
| Posted: 11 Apr 2016 09:59 PM PDT |
| How can black hole post-merger ringdowns occur if the No-hair Theorem is true? Posted: 11 Apr 2016 02:39 PM PDT From what I understand, the no-hair theorem, states that a black hole can be described by its mass, charge and angular momentum. However, a lot of simulations of merging black holes (such as this one, and this from Wikipedia) show a kind of "oscillatory" phase directly after the merger, where the event horizon is asymmetrical, non-spheroidal and warped from the merger. What properties inside, or of, the black hole would allow this asymmetry to exist? I always thought that singularities were just mathematical quirks - surely they don't appear distorted because there are two distinct singularities inside one event horizon? If this is the case, are the singularities continuing to orbit one another inside the event horizon? I suppose that could happen, but then surely they would need to move at a velocity greater than the speed of light inside the horizon. Black hole physics are weird. [link] [comments]  |
| If we could travel at the speed of light, would it ever be safe to travel through deep space? Posted: 11 Apr 2016 04:13 PM PDT Is there any theoretical way to know if you're going to collide with anything? My thinking is that in order to see something in deep space, where there is very little light and very little thermal energy to detect, it will need to be detected with energy emitted from the ship. Travelling at relativistic speed, will a pulse ever make it back to the ship in time for it to change course? Or do we need to fill space with vacuum tunnels and lighthouses to navigate it? [link] [comments]  |
| When does slang become a dialect? Posted: 12 Apr 2016 06:35 AM PDT When do phrases and conventions in common usage transition from being seen as slang to being part of a different dialect or a different language? [link] [comments]  |
| How does the Doppler effect work at relativistic speeds? Posted: 11 Apr 2016 08:13 PM PDT e.g. If I am traveling at the speed of light towards a source of red light, to what extent is the red light blue shifted? Thank you! [link] [comments]  |
| Why is Kepler's emergency mode fuel intensive? What is Kepler doing? Posted: 11 Apr 2016 10:10 AM PDT I can't find much. Does anyone know more? Do we have to wait for another announcement? [link] [comments]  |
| Why wouldn't my friend's idea for "free energy" work? Posted: 11 Apr 2016 12:02 PM PDT This may sound like a /r/shittyaskscience question, but hear me out: So my friend understands that virtual particle/antiparticle pairs are continuously being created and annihilated by "borrowing" energy from the future and the annihilation "repays" it back. And that when this happens on either side of a black hole's event horizon, the black hole has to "repay" the energy and loses mass while the other half escapes as Hawking Radiation. He then reasons, that if he separates the particle/antiparticle pair with an extremely strong electric field, the energy "debt" never gets "repaid", and he has created free energy. Obviously this wouldn't actually work, but I'm finding it difficult to argue exactly why. My reasoning is that either:
Would any of these things be correct? If not, what would be the best way to explain why this system won't work? [link] [comments]  |
| Posted: 11 Apr 2016 02:44 PM PDT What sort of added noise reduction will I receive if I wear both in ear foam buds as well as over the ear protection. Can I simply add the db protection of each for a new rating? [link] [comments]  |
| Posted: 11 Apr 2016 09:01 AM PDT I always look at cemeteries located on large hills or mountains and wonder, are all of the bodies just sitting at the bottom of the hill on top of each other? [link] [comments]  |
| Photonic Laser Thruster - does photon energy diminish? Posted: 11 Apr 2016 08:14 PM PDT I understand that photons possess energy, which is related to its momentum. However, photonic laser thrusters, work by having a laser that is repeatedly reflected back and forth between the spacecraft (lightsail) and a source with mirrors. There are some things that I do not understand, though, and I would really appreciate it if someone could help me out. 1) Why is beam interference an issue, i.e. why are the mirrors designed to avoid beam interference? 2) According to the article, photons transfer energy to the spacecraft via redshift; does this mean that photons gradually loses energy? In other words, how is photon energy transferred? 3) The returning laser would also lose energy to the source, thereby exerting a force. Is the higher mass of the source preventing a significant acceleration? [link] [comments]  |
| What does it mean in physics when something is said to have an "energy level"? Posted: 11 Apr 2016 06:09 AM PDT I've read many times that atoms have "electron shells" that have different "energy levels", with only so many electrons occupying a particular shell. And that these are regions of space that take the forms which are referred to as electron orbitals, and in each of those particular shapes, there is a 90% chance that one will "observe" an electron. Why do they take those particular shapes? Why is it that an electron can be measured to be in one particular region of space more often than a completely different region of space? In addition, what is to be said about the behaviour of the electron when it isn't being measured? I've heard that asking the question of what the behaviour of the electron is like when it's not being observed, is making a categorical error. That is, it doesn't make sense to ask about the behaviour of the electron, when it's not being "measured" (source: https://www.youtube.com/watch?v=UNpLfXOfzZ8). But what does that mean? Does that mean that the electron is still 'behaving' but we lack the cognitive ability to understand how it is doing so? Or does it mean that that particular electron doesn't even exist unless it is measured? [link] [comments]  |
| Does gravity affect the speed of gravity? Posted: 11 Apr 2016 06:20 AM PDT I recently learned that gravity has gravity even if it is very little. So, now I wonder if the speed of gravity is less in high gravity? [link] [comments]  |
| Can acceleration change instantaniously, or is it continuous? Posted: 11 Apr 2016 04:54 AM PDT In the same way position cannot suddenly change (that would be teleportation), and neither can speed (that would require an infinite acceleration, and therefore infinite force), can acceleration change in zero time? If it cannot, can da/dt? If not, what about d2 a / dt2 ? How far does it go until one of them doesn't have to be continuous? [link] [comments]  |
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