Energy & Green Tech

Civil servants, solar panels, and patronage: A Ghanaian case study

Electricity is a hot political issue in Ghana. Ghanaians demand access to the electricity grid as a right of citizenship. And, when not connected, they have threatened in the past to boycott national elections with slogans ...

Energy & Green Tech

Distributed solar prices fall annually by 5% to 7%

The latest edition of Lawrence Berkeley National Laboratory's (Berkeley Lab's) annual Tracking the Sun report finds that prices for distributed solar power systems continued to fall in 2018, that industry practices continued ...

Energy & Green Tech

Novel solar cells arrive at International Space Station for testing

Five different types of solar cells fabricated by research teams at the Georgia Institute of Technology have arrived at the International Space Station (ISS) to be tested for their power conversion rate and ability to operate ...

Energy & Green Tech

How do solar panels work?

How do solar panels work? – Nathan, age 5, Melbourne, Australia.


New technique lets researchers map strain in next-gen solar cells

People can be good at hiding strain, and we're not alone. Solar cells have the same talent. For a solar cell, physical strain within its microscopic crystalline structure can interrupt its core function—converting sunlight ...

Energy & Green Tech

Farewell, oil: It's time to turn our backs on an old friend

They heat our homes, power the coffee maker and keep the factories that make our clothes running. They serve as raw material for our yogurt cups, transport us to work and bring food to the shops. Fossil fuels—oil, coal ...

Energy & Green Tech

Why modified carbon nanotubes can help the reproducibility problem

The search for sustainable energy generation technology has led researchers to investigate various materials and their combinations in many types of devices. One such synthetic material, perovskite, is low-cost and easy to ...

Energy & Green Tech

Locally sourced power may be the answer for vulnerable energy grid

This week, the Pacific Gas and Electric Company took the unprecedented step of cutting power to nearly 750,000 Northern California customers, including much of the UC Berkeley campus, in an effort to mitigate the risk that ...

Energy & Green Tech

All-perovskite tandem solar cells with 24.8% efficiency

A team of researchers at Nanjing University in China and the University of Toronto in Canada have recently fabricated all-perovskite tandem solar cells (PSCs), a type of solar cell with a key perovskite structured component. ...

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Solar System

The Solar System[a] consists of the Sun and those celestial objects bound to it by gravity, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The Sun's retinue of objects circle it in a nearly flat disc called the ecliptic plane, most of the mass of which is contained within eight relatively solitary planets whose orbits are almost circular. The four smaller inner planets; Mercury, Venus, Earth and Mars, also called the terrestrial planets, are primarily composed of rock and metal. The four outer planets, Jupiter, Saturn, Uranus and Neptune, also called the gas giants, are composed largely of hydrogen and helium and are far more massive than the terrestrials.

The Solar System is also home to two main belts of small bodies. The asteroid belt, which lies between Mars and Jupiter, is similar to the terrestrial planets as it is composed mainly of rock and metal. The Kuiper belt (and its subpopulation, the scattered disc), which lies beyond Neptune's orbit, is composed mostly of ices such as water, ammonia and methane. Within these belts, five individual objects, Ceres, Pluto, Haumea, Makemake and Eris, are recognised to be large enough to have been rounded by their own gravity, and are thus termed dwarf planets. The hypothetical Oort cloud, which acts as the source for long-period comets, may also exist at a distance roughly a thousand times beyond these regions.

Within the Solar System, various populations of small bodies, such as comets, centaurs and interplanetary dust, freely travel between these regions, while the solar wind, a flow of plasma from the Sun, creates a bubble in the interstellar medium known as the heliosphere, which extends out to the edge of the scattered disc.

Six of the planets and three of the dwarf planets are orbited by natural satellites, usually termed "moons" after Earth's Moon. Each of the outer planets is encircled by planetary rings of dust and other particles.

This text uses material from Wikipedia, licensed under CC BY-SA