Energy & Green Tech

Strong sunlight powers passive cooling device

A simple cooling system driven by the capture of passive solar energy could provide low-cost food refrigeration and living space cooling for impoverished communities with no access to the electricity grid. The system, which ...

Energy & Green Tech

Busting the problem of cloud cover

The downside to solar power is that it's not always sunny and so grid operators have to compensate for energy drops by bringing alternative generation sources online. New research in the International Journal of Powertrains, ...

Energy & Green Tech

Solar cells with 30-year lifetimes for power-generating windows

A new transparency-friendly solar cell design could marry high efficiencies with 30-year estimated lifetimes, research led by the University of Michigan has shown. It may pave the way for windows that also provide solar power.


Inequality built into the grid

It is known that future uptake of distributed energy resources like wind and solar could be limited due to constraints in electrical grids. Now, a study from Berkeley researchers shows that grid limitations in California ...

Energy & Green Tech

Report: Solar could power 40% of US electricity by 2035

Solar energy has the potential to supply up to 40% of the nation's electricity within 15 years—a 10-fold increase over current solar output, but one that would require massive changes in U.S. policy and billions of dollars ...


AI-powered tool used to map sustainable roofs globally

As cities around the world continue to urbanize, there is a greater need to expand and optimize existing spaces. Cities have accelerated looking into how underutilized rooftop spaces might contribute to climate action, food ...

Energy & Green Tech

North African sun offers green hope but state role key

Blessed with year-round sunshine, North Africa has enormous potential for solar energy, but the huge investment and state subsidies required for large-scale projects are a challenge for cash-strapped regional governments.

Energy & Green Tech

Green roof or solar? It turns out both is best

The benefits of combining solar panel installations with green roofs has been confirmed by new research, which demonstrates significant improvements in energy production, stormwater filtration and most surprisingly, a major ...

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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