Solar Definition and 1000 Threads

I know that if I have a two-body system, the sun and the earth, then the common centre of mass is orbited every 365 days. What about if I add another planet in, say jupiter? Does the sun still orbit the centre of mass every 365 days? With two bodies, their orbital period about the centre of mass...

Okay, so if I we're in space and I kept going down past the solar system, what would I find? would there be another universe? Or would there be a flat surface?

How much current can be forced through a photovoltaic (solar) cell before its performance starts to deteriorate? In certain accelerated lifetime testing 1.25xIsc is forced through a solar module while it sits inside a chamber (no incident light). Is there a theoretical limit to the amount of...

I'm an undergrad (so my simulation is VERY simple), writing a java program to simulate the solar system. And I'm a bit stuck on how to calculate a couple of important things. I'm literally right at the start of this, with just a sun and an earth. Initially I had my Earth going round my...

Good day, When dealing with AGM deep cycle solar batteries, is there a difference between the following two wiring methods? By the way, I found these pictures online but they describe the two scenarios Basically the two are almost identical but on one you are grabbing your positive and...

So off to Mars we go. But really how are we going to get there? The most expensive part of space travel is overcoming atmosphere. So you could say the biggest obstacle of space travel is Earth travel. It takes virtually no energy to cross space but it takes massive amounts to get into space...

hi i wonder be able to help me i got a 150w solar panel , and a 20a charge controller and two marine http://www.ebay.co.uk/itm/252019284625?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT i want to run the dvr box which is using around 12v 5a i want it to be on 24/7 do i have enough...

http://www.sciencedaily.com/releases/2015/10/151026112106.htm Will a solar storm hit us soon, or was this a one off event

Homework Statement a) The peak intensity of light from the Sun occurs at a wavelength of 500 nm. Astronomers discover a nearby star, “Nus”, which is the same size and mass as the Sun, but has a peak wavelength of half this value. Is Nus hotter or colder than the Sun and by how much? Nus is...

If anyone knows a reference that discusses this question, please post a citation. Naively it seems that any central mass would attract DM from the mass's general vicinity so that an approximately spherically symmetric accumulation would develop over time about the central mass. This seems to...

Hi Is there a software in which I can for example change the orbit or angular velocity of the moon and observe it's effects on Earth's daytime/nighttime? I want to use it for teaching so I need it to be visual. thanks.

This is not actually a homework assignment, but something I decided to try in my own time. I wanted to find the radius from a star at which a solar sail would be held at equilibrium (radiation pressure = gravity), given mass per unit area and stellar luminosity at a reference radius. So I...

I want to know that if we double the mass of the planets and our sun in the solar system,then will it make any difference in the orbits of the planets?will it be necessary to double the distance of each planet from sun?(I am asking it assuming that the sun on doubling of its mass,don't turn into...

Suppose a star passed by our solar system. How close would it have to come before the orbits of planets was significantly and permanently perturbed? How close to cast a planet out of orbit? Let's say that that star is a cold neutron star, so we know its mass (1.5 solar masses) and don't have...

Homework Statement Consider a small, spherical particle of radius r located in space a distance R = 3.75 × 1011-m from the Sun. Assume the particle has a perfectly absorbing surface and a mass density of ρ = 3.8-g/cm3. Use S = 214 W/m2 as the value of the solar intensity at the location of the...

I am having trouble with this problem. I have drawn the diagram , but don't know how I can attach it onto this post. But, for a I have COP= Qin/Wcycle = 650 J/m^2 s / Wcycle = 32.5 kW/Wcycle --> Wcycle = 10.15 kW. But,that is the wrong answer.[PLAIN]http://

I'm curious if anyone can validate the efficiency of a multilevel inverter. I've been thinking about them as a better solution for PV conversion. They seem to have many advantages, but when I look at it, a single phase output can seemingly only draw power from, on average, around half of the...

Overall this Solar Max has been pretty disappointing. But occasionally the Sun as shown brief bursts of good activity over the last week, and for a few more days, there has been a large sunspot group traversing the solar face. AR2403 is a massive spot group and one of the largest this solar max...

I'm sorry if this isn't the right place for a shopping question, but I'm not sure where else to go for advice. I got a https://www.amazon.com/dp/B0094KM4VK/?tag=pfamazon01-20 on sale and the unit is great, but the batteries don't hold a charge very well, especially when using rechargeables - it...

Hi. I am confused about something and it is making me feel rather stupid. First of all i will explain what i know. I know a solar day is 24hrs long and it is defined by the position of the sun. I also know a sidereal day is 23h 56m and is defined by the postition of the stars (basically)...

Elements like Silicon, Germanium and Gallium can be used to make solar cells but platinum can not be used. What is the exact reason? Is it related to threshold frequency? Tried to search for the answer through many sources, but couldn't get a satisfactory one. Your views and answers are really...

Can I coax a solar charge controller to accept output from 16 piezo transducers, (20mm buzzer type disk piezo elements). The charge controller has an LCD display with readouts for voltage and amps.

Hello, I am considering to do a phD in solar panels, because it seems to connect areas I've been studying for a while. I am almost a chemical Engineer with master in physics and Science/Technology Bachelor. I'd like to do some on solar panels connected to physics, like quantum dot or something...

Hi, Just wondering: The lunar orbit around the Earth is tilted 5.1 degree with respect to the Earth's orbit around the sun (as described in the video), so only at 2 times during the year the Earth is aligned with the sun such that lunar eclipses can happen IF the moon is behind the Earth...

This question and answer are posed in Kim Stanley Robinson's novel "2312". My question is, is this all made up? Or might it be accurate?

Homework Statement "The urban heat island (UHI) effect refers to the phenomenon of a metropolitan or built up area which is significantly warmer than its surrounding areas." Using white paint in roofs increases the solar reflectance and decrease the thermal intake into a building. Question:-...

Here's the main problem. I'll like a function of distance with respect to time which moves the planets in accordance to Kepler's law: planets in orbit travel equal area in equal time. I use a blender, a 3D app that allows for path programming.

Hello everyone! I have a thesis to design a temperature stabilizing(controlling) system for solar cells.I need to use 12V Peltier battery and a simple pc fan.Any further help is appreciated.

Can someone help me understand the following figure? It shows how the conversion of neutrons (electron neutrinos=red, muon neutrinos=blue) is happening through the Sun for different cases of the core's density (relative to the resonance density). I only understood the top figure, which tells...

I don't know how long this solar sail idea has been here , the Planetary society's second solar sail failed to achieve its objective right ? I am interested in the applications of this technique. 1) Is it possible to use them to deflect large asteroids and comets away from the Earth ? 2) Is...

I've heard a lot of people talk about solar sails versus things like Ion thrusters, and it seems that both have their advantages and disadvantages. So I was wondering whether or not it's possible to use both on a single spacecraft ? That way you could get the speed of an ion thruster along with...

Hi mfb: The following messages were in the now closed thread "Neutrinos-Antineutrinos in the universe". Bill_K said (msg #2): Most of the neutrinos we detect are solar neutrinos coming from p + P → d + e+ + ν. I said (msg #5): Is the "P" here a typo where "p" was intended? If not, what does...

Hi, I am working on Solar systems in Australia. I want to know the Australian standards for grid connected PV systems for voltage, power factor, reactive power etc.

We've got a scalable sun tracker that requires no electricity. See << Link removed by Moderator >> Though invented for use as a less expensive alternative to the traditional electric motor solar trackers, we have come to realize that it can actually lift a lot of weight. We haven't tested the...

Hi all, First time post, long time lurker, sorry if this is in the wrong section. I am currently looking at a project that requires a large solar panel array onto a very tight roof area; maximising space is therefore important. Thus, keeping the panels as close together is important. I have a...

Hi As far as I know the Earth orbits around the Sun Earth barycenter while the Sun orbits the Solar System BaryCenter formed by the changing center of mass of the Solar system. So even while the Sun orbits the SSBC and Earth orbits the Sun-Earth BC it would not be true to say the Earth...

Is solar uv completely blocked from reaching Earth or do we just need more sensitive uv detectors to make ground-based observations? In particular of the uv wavelengths corresponding to hydrogen Lyman series lines.

Hey physics forums Do you know if you can cut this mono crystalline solar cell in half: https://www.amazon.com/gp/product/B00ISVLPN4/?tag=pfamazon01-20

I was having a discussion with a friend, and my side of the argument was that for solar to work you also need a lot of fossil fuel running in the back ground just during the day, making it very expensive. Let's take New york as an example. Let's assume they have enough solar panels to produce...

I am an electrical engineering student. I have been on summer break for a few weeks now and I had time to work on my project. This is not a school project but something I had wanted to complete for a while. I haven’t decided what I am going to do with it yet. I just built it for the fun of it...

(I am a big newbie when it comes to electrical circuits) So I am searching the Internet for how the Solar inverters work. Most schemes that I come across have an H-bridge with some sort of transistors. Now how I understand the transistors are controlled by an oscillator and bridge itself then...

I now know that an insulator will not only keep heat in but keep heat from being conducted in the first place So my solar still is almost 100% metal including the 2 valves. There is however 1 plastic pipe between the rain collector and the evaporator that is flexible. My solar still has several...

Homework Statement Hi! I have a problem with the following problem: Calculate the efficiency of the solar cells with the characteristics given in the table below Power (28 degrees, BOL): 300 W/m2 Absorptance: <91 , emittance: >82. Reliability: 0.999 . Mass: 2 kg Homework Equations I know...

I have seen a lot of effort go into finding cheap, safe, high energy density phase change materials to store energy in the form of heat so power produced during the daytime may be delivered at night time. But I have an issue with storing energy in phase change materials. They rely on chemicals...

(Sorry for my bad English, I'm from Germany) Hello! I need to build a solar cooker as a school project. Our build needs to be able to heat 1 liter of water in 80 minutes. My idea was, to heat the water by using a fresnellens. I've bought a 15.6 x 15.6 inches fresnellens for that. I thought...

The Sun emits approximately 1361 watts per square meter on Earth. I read in a book that since the Earth is approximately a sphere and only half of it is being illuminated by the Sun, the solar irradiance at the lit side of Earth is reduced by half (so around 680 watts per square meter). Is this...

so I'm doing a little project in solar thermal energy and I want to do the calculations before I start anything. I am stuck on getting the value of the pressure of the water inside the absorber when the temreture gets to 350 C. Is there a way to calculate it using thermodynamics table or...

Like asteroid clusters or any kind of what-not thought to be part of our solar system?

I was wondering in Schottky junction solar cells, how is the open circuit voltage dependant on the built in potential and the Schottky Barrier Height?

solar updraft tower: How small a working unit can be made? My reason to ask this question is: I think that if a commercial unit is ever to be built, first the concept must be widely established. One or two working examples of a size similar to the prototype built in Spain won't likely prove...