Solar Definition and 1000 Threads

In this alternate universe, Earth is the same as back home--8,000 miles wide, 25,000 around, six sextillion tons, orbiting a G-type main-sequence star from a distance of 93 million miles. But here, the similarities end. MOON DIAMETER--3,273 miles MASS--0.025x that of Earth DISTANCE FROM...

I'm needing to reflect additional solar into a greenhouse to increase plant beneficial PAR light (400-700nm) while restricting and minimizing excessive IR heat also building up inside, too. I'll be using 400 sq ft of flat plate reflectors (40'X10') at ground level horizontally positioned along...

Hey guys, Is it possible to travel with high speed beyond a solar system or a galaxy? Or is there something that will prevent something to move at high speed outside a solar system or a galaxy?

Hello, I'm trying to teach myself ...still learning...but I'm stumbling. I have a 15W solar panel whose output is 5V and 2.1A. I wish to charge a 12V battery (98Wh/8800mAh), but am unsure how to do this calculation as approximate time it would take (Assume sunny days - I know it's an...

Good afternoon, I am currently trying to unnderstand Community Solar projects. I know how it works in the US and Europe but in our country the regulation of Net Metering does not exist. Can I find someone in the community who has thought about connecting retail clients or industrial clients...

You can burn a hole in paper using a magnifying glass and light. What would happen if you applied this large-scale on a solar panel?

This seems over optimistic to me but is 20% the speed of light feasible? https://www.sciencedaily.com/releases/2017/02/170201162456.htm

Does anyone know of a website with an accurate ephemeris where you can plug in a time and get the state vectors (position and velocity) for the sun and all of the planets in a barycentric coordinate system?

I seek from an SF writing point of view some much-needed clarification about solar flares, in particular their shortwave radiation components. So, given that x-rays, gammas and the like, propagate through space at light-speed - along with the rest of the electromagnetic spectrum - I take it then...

I am currently re-fabricating solar concentrator dishes to allow for automatic tracking of the sun during the day and month. The industry term for these dishes is 'CSP' (Concentrated Solar Power). Task at hand: The CSP parabolic dishes are currently manually adjusted to the position of the sun...

Assume that you are commissioned to select three solar system bodies (planets or moons) to deposit a colony of bacteria or microbes of your choice outside (i.e. either on the surface or underground, but not in any man-made enclosure). No resources from Earth (such as food, water, organic...

I wonder if someone can tell me if I have interpreted the cited article correctly. https://arxiv.org/abs/1306.5534 The article seems to have calculated upper bounds on the density of DM for different parts of our solar system. We have found that ρdm is less than 1.1⋅10−20 g cm−3 at the orbital...

Hi , How can I calculate the resistive heating occurring in the internal resistances of a solar cell ? Are ohm's law or the power dissipation relation P=RI2 applicable in this case ? if not the case how can we calculate the resistive heating there? Thank you in advance for your help

I am given the solution to the first part of the problem, however not the second part - would appreciate for someone to double check my work! Cheers. 1. Homework Statement If a scale model of the solar system is made using materials of the same respective average density as the sun and...

Homework Statement My book states that solar cells are joined in series and in parallel to give a greater power because P=VI is increased by increasing V and I. Homework EquationsThe Attempt at a Solution I assume that the current in the solar cells depend on the intensity of sunlight. The...

Why must we place the anti-reflection glass on top of the n type semiconductor? ( Why must the sun light incident on the n type semiconductor? )

So I am trying to figure out how much Wh I would have with these solar cells I have. Each solar cell is rated to have 2.8w. Does this mean if I have 40 of them I would have 112 wh? I am going to be putting the solar cells in series. Does this affect the power? I know adding in series is good...

What is?

I know that the overall temperature of the universe is microwaves at 3 Kelvin or so from the Big Bang, but is this mostly for deep space? Or is this pretty much the temperature in our solar system also, assuming a coordinates some distance away from any of our planets but still within our solar...

This is a fun thought experiment; Why not have space based mirrors to reflect light down to Earth at night to make solar do a little extra generating! The cost of solar is coming down and the cost of lifting things into orbit is coming down, so why not. Plus gold is very reflective, light...

I was thinking of ways of making carbon cleaner for the environment. One of the ways I came up with is filling a solar updraft tower https://en.wikipedia.org/wiki/Solar_updraft_tower with the exhaust from a gas/coal plant. So you'd get a true greenhouse gas accumulation of heat going in the...

Hi everyone, so I'm trying to achieve IV curves based on how this website had done below: http://www.voltaicsystems.com/blog/solar-charger-tutorial-part-2/ But whenever I increase the resistance, the amperage increases rather than decreases! For example, when I use a 500 ohm resistor the...

Homework Statement i)A beam of light at wavelength 600nm, with spectral width of 4nm and spectral radiance of 1300 Wm-2μm-1, illuminates an area of 10cm2 . What is the voltage this beam could generate if converted to energy? ii) What current could this beam produce? iii) How would the current...

Approaching Earth from 100 light years (by Earth's measurement) at the fastest theoretically (not practically) possible velocity where from your relative near-c frame the distance is foreshortened to 1 Planck length and a century elapses in Earth's time frame to 1 Planck time in yours, how would...

The engine of a solar car I am designing(for my fictional stories but I would like a scientific point of view on this) is literally a DC circuit combined with mechanical force. First of all, there is a rechargeable battery. I would say it is about 24V fully charged. There are 2 wires coming off...

ok I know that anybody in the heavens will bend spacetime with the gravity it has. What I was wondering was how do we measure around them like from the Earth to mars. When Mars in now quit on the opposite side of the sun ( so we can see it at sunset). do we measure the parabolic curve in...

Are all planets in our Solar System in the same plane ? :))

Homework Statement I'm doing an assignment on cathodic protection systems using solar energy and have no idea on how to construct an efficient system. All the ones online are too basic and don't specify whether the panels are in series or parallel or not. I've calculated that the system needs...

I am working on building a solar powered toy car for my own edification. The problem I have is that I do not have enough power to start and continue the dc motor(s). I could add a bigger solar panel but I am trying to think of a way that the solar panel could simply collect the energy, store...

Hi, I am trying to build a solar powered toy car. And no its not for my son, its for my own curiosity. The problem I am having is that...while the solar panel is sufficient to rapidly turn the (4) micromotors 6 inches away from a lightbulb it isn't sufficient to even turn the wheels when I put...

I am making a self cooling & self cleaning solar. I have already finished the cooling part by attaching fins from the back of the solar. Now, I am going to clean the solar using compressed air system. I am going to attach a 35 in tube from one of the sides of the solar and has a diameter of...

hi, i want to know that how many techniques are being used for charge separation? and which one is more effective for solar cell? can you give some idea about it that which one is better and how to make better power conversion efficiency. after going thoroughly through literature review i am...

Wikipedia says that solar core has 15 millions of Kelvins ( https://en.wikipedia.org/wiki/Solar_core ), what translates into ~1.4 keV energy per degree of freedom. For nuclear fusion we need to take the two nuclei to distance of range of nuclear forces: ~1fm (...

Hi guys, This is basically a quick question to hopefully find some pointers on a topic I've been browsing the internet on to not much success. Basically the topic I'm trying to find more information on is the angular momentum problem with the "nebular hypothesis" of the formation of our solar...

First of all, even I did mentioned Solar Cooker, the main goal is to reach most temperature of 500ml of water in 30 minutes. Basic information that I have is some material with different thermal conductivity. I seek for simple english language and a bit complex physics language. The idea of...

I've been tinkering with a few diagrams in an attempt to illustrate the motion of the solar system in its journey around the Milky Way. I also wanted portray how the celestial, ecliptic and galactic coordinate systems are related to each other in a single picture. Note: in the Celestial, or...

Looking for recommendations for two commercially available films and coatings, the best for... #1 - Maximum reflectance, regardless AOI, for short wave sunlight primarily and, secondarily, reflects some or a lot of long wave, and thirdly, also good emissivity for any of the spectrum. Appreciate...

Hi, I am trying to find out series and shunt resistance of solar cell from I-V curve which starts from Isc and going to Voc. I read some papers and for single illumination mostly said Rs= -(dv/dI)V=Voc and Rsh= -(dv/dI)I=Isc. so I am finidng Rs from slope between points from Vmax to Voc, and...

I thought about a solar furnace prototype. It is like this: light from the Sun is concentrated with a system of parabolic and plane mirrors on the surface of a rock, which is contained inside a vessel. The light and heat is not meant to reach the vessel, only the rock; the vessel could be...

Disclaimer: The questions below were raised by an article that's most definitely pseudoscience. The questions themselves have nothing to do with what makes it "pseudo", though, so don't let that put you off, please. :)Quoting from [crackpot link removed by mentor] (I'd advise you only to read...

Poster's warning: this will be the second time I've touched upon the subject of solar flares here in Physics Forums, for which I offer my apologies. Nevertheless, I seek clarification about the likely effects of what a seriously powerful flare (or CME) would have, either upon an astronaut in...

I need a planet to be orbiting it's sun in a polar orbit. Is this a stable configuration?

I understand that the fusion of hydrogen to helium in our sun's core generates gamma rays. My question is how are these gamma rays transformed to the full spectrum of photons that we that we observe from earth?

Assuming that a black solar panel has an efficiency of 20%. This energy could be used instead of burning oil and decreasing CO2 emission. But the black color also accumulates a significant amount of the solar energy into heat locally on planet surface. Comparing this with a white panel (non...

How much energy can be produced by a solar cell in mars?

My longtime friend moved recently and his new place has an in-ground pool. He's a bit* of an Engineering nerd he has decided to build a solar heater from scratch. Him being a neophyte at the art of pool science though, I felt it my duty - despite being someone who never got his own custom...

If you can spare the time to listen to this ADVERT, do you believe solar power will over take oil? http://pro.moneyweekresearch.com/FTI-launch-29AIMAD/PFTIS7A1/Full?h=true

Hello, I Have built a 50w solar panel that gives an output of ~ 9.2v @ 5-6 amps during a good day. This is not enough to charge a 12v battery. To get around this, I am trying to use a DC-DC boost converter (specifications are below) and it is set to give an output voltage of 13.5v. The only...

Hi everyone i am working on a solar tracking system for a.solar panel that i made wheighting about 30kg , i was wondering where to start looking for books where they may give examples of.such devices with mechanisms and control theory or if.by any chance you have knowledge on the subject and...

Hello, I'm working on simulation of hydrogenated amorphous and microcristalline silicon solar cells. The software I use is AMPS 1D So, I need (n,k) of hydrogenated amorphous silicon carbide (a-SiC:H) Thank you