If light doesn't dissipate with travel distance and the universe is infinite, why isn't the night sky bright? |
- If light doesn't dissipate with travel distance and the universe is infinite, why isn't the night sky bright?
- When a water filter (e.g. Brita filter) is past its expiration date, is it just not filtering very well anymore, or is it actively making the water worse?
- What causes a plane to make that "divebombing" sound when it nosedives towards the ground?
- How does a pop-fliter for a microphone work?
- Why does water that is sitting in a metal water bottle have a metallic taste?
- What breaks objects, the force, or the energy?
- Why do proteins contain only the L isomers of amino acids and not the D?
- Is there a universal unit for measurement of mass?
- Can you donate your blood once you're dead much like you can your organs--or can it not be used?
- How can something be strong and brittle like tungsten, isn't that contradictory?
- Why do forklifts use propane as fuel as oppose to another fuel?
- Was Earth's orbital period always the same through it's history?
- How do spiders spin up a really long horizontal web between two bushes?
- Does hormonal birth control affect fecundity in later life after cessation, since they prevent ovulation which leads to more eggs in the ovaries?
- Are the two electrons in the Helium atom in the same energy state?
- How do scientists know Mars' (and other planets) air and soil's compositions, air pressure, etc.?
- A few days ago, a small asteroid burned up in the atmosphere; what happens to the matter?
- What device could I use to measure both Electric and Magnetic Fields?
- How does salmonella cause homeostatic imbalance?
- Can we estimate where the barycenter of the universe is?
- Could volcanic eruptions eventually deplete the Earths core?
- Why is New York colder then London in the winter even though London is a lot further north and New York is on the same latitude as Spain?
| Posted: 04 Jun 2018 11:49 PM PDT I read that in vacuum light doesn't dissipate so it travels infinitely. If the universe is infinite as well though there should be an infinite amount of stars visible on the night-sky or if you want to amount for light pollution, there should be when you're watching from Space. I have a few theories why it could be (finite amount of light spread too thin, infinite amount of planets/asteroids getting in the way...) but let's hear it from someone who actually kbows their shit :) [link] [comments]  |
| Posted: 05 Jun 2018 07:10 AM PDT |
| What causes a plane to make that "divebombing" sound when it nosedives towards the ground? Posted: 05 Jun 2018 04:50 AM PDT |
| How does a pop-fliter for a microphone work? Posted: 05 Jun 2018 12:01 AM PDT |
| Why does water that is sitting in a metal water bottle have a metallic taste? Posted: 05 Jun 2018 06:53 AM PDT I just drank out of my metal water which had water sitting in it for about a week, it tastes metallic. Why? What is the mechanism ? [link] [comments]  |
| What breaks objects, the force, or the energy? Posted: 04 Jun 2018 06:33 PM PDT Given a scenario where i have a ceramic tile and a rock, when i place the rock onto the tile it doesn't break, but when i drop the rock from a height it does, but in the scenario the force(weight) doesn't change, the only thing that does is its height and therefore its gravitational potential energy. [link] [comments]  |
| Why do proteins contain only the L isomers of amino acids and not the D? Posted: 05 Jun 2018 07:21 AM PDT |
| Is there a universal unit for measurement of mass? Posted: 05 Jun 2018 05:55 AM PDT Time can be measured by 9,192,631,770 cycles of the radiation from a cesium atom. This should be essentially the same no matter where you are in the universe. This is something that in the far future, no matter where you are from (e.g. another planet) the measurement remains the same. Mass on the other hand is measured in kg or lbs. These are relative to the Earth's gravity, thus not a "universal" unit of measurement. My thoughts would be something along the lines of a gravity well displacement or a measurement of Higgs field interaction? These would not rely on understanding of our home planet's gravity well, but would allow for description of an object at any size or density. If it doesn't exist, how would you go about calculating a new unit of measurement?? [link] [comments]  |
| Can you donate your blood once you're dead much like you can your organs--or can it not be used? Posted: 04 Jun 2018 05:51 PM PDT |
| How can something be strong and brittle like tungsten, isn't that contradictory? Posted: 05 Jun 2018 04:46 AM PDT Like I hear so much that "tungsten is strong" but it's also brittle like how the hell is that possible? [link] [comments]  |
| Why do forklifts use propane as fuel as oppose to another fuel? Posted: 04 Jun 2018 01:33 PM PDT At work, we have multiple forklifts that use propane as the fuel. They run out of fuel quite often and I have only heard of propane being used for cooking. What properties make it ideal for forklifts? Does is burn differently that other fuels? Thank you. [link] [comments]  |
| Was Earth's orbital period always the same through it's history? Posted: 05 Jun 2018 07:36 AM PDT We know that around 1.4 billion years ago day used to last only 18 hours or so. What about Earth's orbital period, was it always the same length of time or it also changed through history. If yes, how big of a change was it from beginning of Earth to now and do we even know? [link] [comments]  |
| How do spiders spin up a really long horizontal web between two bushes? Posted: 04 Jun 2018 03:06 PM PDT Whenever I've hiked along a trail and torn apart a spiders web, I've always wondered that to myself. Often times it's just a single strand. How does a spider manage to cross two bushes with a web, seemingly building a bridge between them? [link] [comments]  |
| Posted: 04 Jun 2018 07:15 PM PDT |
| Are the two electrons in the Helium atom in the same energy state? Posted: 05 Jun 2018 05:00 AM PDT Are the two electrons in the same energy like two non-interacting electrons in a hydrogen atom (hypothetical) where the groundstate is degenerate due to spin? Or are the two electrons in different energy levels due to Coulomb repulsion? [link] [comments]  |
| How do scientists know Mars' (and other planets) air and soil's compositions, air pressure, etc.? Posted: 05 Jun 2018 04:58 AM PDT |
| A few days ago, a small asteroid burned up in the atmosphere; what happens to the matter? Posted: 04 Jun 2018 07:03 PM PDT Does it just settle to earth? Or is it somehow ejected back into space? [link] [comments]  |
| What device could I use to measure both Electric and Magnetic Fields? Posted: 05 Jun 2018 03:20 AM PDT May be an odd question but I'm looking for a device that would be able to measure up to 10,000V/m and up to 1,000uT. I have a device that can do both but it maxes at at 2000V/m and 100uT. Any help would be massively appreciated! [link] [comments]  |
| How does salmonella cause homeostatic imbalance? Posted: 05 Jun 2018 03:05 AM PDT My teacher in class was talking about homeostasis and she gave an example of salmonella as something which causes homeostatic imbalance. How is this so, since salmonella only stays in your digestive system, or does it spread to other body systems as well? [link] [comments]  |
| Can we estimate where the barycenter of the universe is? Posted: 04 Jun 2018 10:11 AM PDT |
| Could volcanic eruptions eventually deplete the Earths core? Posted: 04 Jun 2018 08:29 PM PDT |
| Posted: 04 Jun 2018 01:50 PM PDT |
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