Do satellites, like the Hubble Telescope, get dirty? |
- Do satellites, like the Hubble Telescope, get dirty?
- Are rates depression and anxiety on the rise (and if so, why)? Or are we just diagnosing it more because we’re more aware of it?
- Why are tsunamis wave heights measured/described as being much taller than they actually seem to be?
- How high can insects fly? And why would they do it?
- How do we calculate distances to celestial bodies?
- Are seemingly sealed surfaces also completely sealed at the molecular level, or do they leak?
- How is RISC-V different from normal RISC?
- Exactly how do you hook up new organs in the body to the blood vessels during a transplant?
- How would a moon with a more elliptical orbit impact life on Earth?
- How does a vine searching for and object to climb “know” not to wrap around itself?
- Why do acids tend to be corrosive?
- How does a computer actually 'turn on'?
- Why is an object's temperature and black-body emitted radiation related by a power of four?
- Can wild type insects make mistakes?
- Why don’t the rings of Saturn and other big planets get pulled into the core by their massive gravitational force?
- Is it possible to predict the appearance of a substance/material based on a few of its atoms?
- [Semiconductor] With Gallium being a popular compound semiconductor material for various electronic device applications, how come Gallium Oxide has only very recently (within the last year) garnered the attention of scientists as a prospective material for future electronics?
- Does Space Debris affect the ISS?
- Why use the ideal gas constant in aqueous solution electrochemistry?
| Do satellites, like the Hubble Telescope, get dirty? Posted: 26 Aug 2018 09:49 AM PDT I just saw a question asking about the remaining lifespan of the Hubble Space Telescope, and I was wondering if there is anything in space that causes satellites to get dirty, or rust, or otherwise deteriorate. [link] [comments]  |
| Posted: 26 Aug 2018 07:14 PM PDT |
| Why are tsunamis wave heights measured/described as being much taller than they actually seem to be? Posted: 26 Aug 2018 08:36 PM PDT What I mean is, for example, the 2011 Tohoku earthquake and tsunami in Japan. The tsunami had waves of up to 40.5m (133ft). That's just a little bit taller than the statue of liberty. But when I watch videos and clips of the tsunami making landfall, it doesn't seem anywhere near 40.5m tall. I literally imagine a wall of water the size of the statue of liberty when it's described like this (kinda like in the movies). So how are tsumani wave heights actually measured? [link] [comments]  |
| How high can insects fly? And why would they do it? Posted: 26 Aug 2018 12:53 PM PDT |
| How do we calculate distances to celestial bodies? Posted: 26 Aug 2018 01:26 PM PDT How do we know that Andromeda is 2.5 million light years away? Is there any way we can tell that the light we are getting from Andromeda is 2.5 million years old? Edit: I used Andromeda as just an example. [link] [comments]  |
| Are seemingly sealed surfaces also completely sealed at the molecular level, or do they leak? Posted: 26 Aug 2018 12:32 PM PDT For example, in a water bottle that is completely closed and sealed, do the walls leak water molecules at the microscopic level? Do molecules or atoms inside a container slowly get through the cracks between bonds of the container's material? [link] [comments]  |
| How is RISC-V different from normal RISC? Posted: 27 Aug 2018 01:39 AM PDT I've heard that RISC-V is a open source architecture, how exactly is it open source and what are its benefits? How small is the processor and how small can it get? What is the performance like? Is it a big deal for general computing? [link] [comments]  |
| Exactly how do you hook up new organs in the body to the blood vessels during a transplant? Posted: 26 Aug 2018 03:04 PM PDT Questions says it all. In cars if you replace the engine you have to also reconnect the wiring harness etc. How does this work with organs? [link] [comments]  |
| How would a moon with a more elliptical orbit impact life on Earth? Posted: 26 Aug 2018 12:01 PM PDT What impacts would the moon having a significantly more elliptical orbit (similar to Pluto's) have on the rotation of the Earth, phases and tides? [link] [comments]  |
| How does a vine searching for and object to climb “know” not to wrap around itself? Posted: 26 Aug 2018 10:20 AM PDT I've seen a time laps video of a climbing vine and as it circles around searching for something to climb it seems to run into a chute from itself. Upon interacting with itself it simply disengages and continues its search for another object. How does it recognize itself? [link] [comments]  |
| Why do acids tend to be corrosive? Posted: 26 Aug 2018 11:52 AM PDT |
| How does a computer actually 'turn on'? Posted: 26 Aug 2018 08:33 AM PDT I have seen things online, but they're all incomplete or outdated. [link] [comments]  |
| Why is an object's temperature and black-body emitted radiation related by a power of four? Posted: 26 Aug 2018 01:33 PM PDT I've been getting into the fundamentals of satellite remote sensing and I have a question motivated out of pure curiosity. The Stefan–Boltzmann law describes that the amount of radiation an object emits is related to it's temperature. A small change in temperature, T, causes a huge change in radiation, M = k*T^4, where k is a constant. My question is, where does this fourth power come from? Is it related to Rayleigh scattering being inversely proportional to the inverse of the fourth power of radiation wavelength? [link] [comments]  |
| Can wild type insects make mistakes? Posted: 26 Aug 2018 10:54 AM PDT How tied to instincts are they? Do they sometimes do things that they shouldn't do according to instict, assuming there are no abnormal parameters? If you filmed an ant for a few weeks, would it sometimes trip over its own legs? (failure in hunt excluded from this question) [link] [comments]  |
| Posted: 26 Aug 2018 08:50 AM PDT |
| Is it possible to predict the appearance of a substance/material based on a few of its atoms? Posted: 26 Aug 2018 05:42 PM PDT For example, does an Aluminium atom appear to be silver and shiny? I'm assuming it all goes down to how a group of the bonded atoms are able to reflect and absorb visible light, but is there any way to predict it? If so, what would a Synthetic atom, say Oganesson 118, look like? [link] [comments]  |
| Posted: 26 Aug 2018 12:13 PM PDT Gallium Arsenide and Gallium Nitride are commonly used compound semiconductors that have been of interest for a few decades. How come scientists didn't think to use Gallium Oxide until just recently? All you would have to do is just oxidize Gallium to make Gallium Oxide. Now I understand in reality, it isn't as simple as Silicon oxidation, since a process like thermal oxidation will result in an amorphous oxide. So if thermal oxide is used to grow Gallium Oxide (amorphous), can that only serve as a dielectric? Is it a mandatory requirement that Gallium Oxide has to be in the crystalline form to act as a semiconductor? (I assume yes, because a crystalline structure is required for conductive paths for electrons/holes to flow.) So then what was the breakthrough that brought scientists their attention to Gallium Oxide? Was it just that scientists finally figured out (maybe by accident?) how to grow Gallium Oxide in crystalline form? If that was indeed the breakthrough, then should we expect research going into the growth of crystalline Silicon Oxide? (If crystalline Ga2O3 is possible, why not crystalline SiO2?) [link] [comments]  |
| Does Space Debris affect the ISS? Posted: 26 Aug 2018 10:23 AM PDT Recently saw that there are roughly 15,000 pieces of space debris orbiting Earth. I know they pose threats for various satellites, but do they pose any threat to the International Space Station, and if so, how does the ISS avoid it? [link] [comments]  |
| Why use the ideal gas constant in aqueous solution electrochemistry? Posted: 26 Aug 2018 08:22 AM PDT Why is the ideal gas constant (R = 8.3145 J/mol•K) used in the Nernst equation and Nernst-Planck equation when working out the electrochemistry of aqueous solutions, when aqueous solutions are not gases and rarely ideal? [link] [comments]  |
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