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Solar Energy
- Photovoltaic cells, which convert sunlight into electricity.
- Solar thermal technology, where heat from the sun is used to make hot water or steam.
- Passive solar heating, which can be as simple as letting the sun shine through windows to heat the inside of a building.
- How do you get energy from sunlight?
- What are the various methods of using solar energy?
- How does the sun sustain itself?
- What are two methods for using solar energy?
- What are two ways to collect solar energy?
- What year will the Sun explode?
- How does the Sun keep burning without oxygen?
- What happens when sun dies?
- What is the main source of solar energy?
- How long will the Earth last?
- Can a black hole happen on Earth?
- Will Sun become a black hole?
- What keeps sun burning?
- How can the sun burn for so long?
- Will the sun ever burn out?
How do you get energy from sunlight?
During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.
What are the various methods of using solar energy?
There are two main methods: photovoltaic cells and solar thermal collectors. While solar thermal collectors are typically less complex, photovoltaic cells can be more useful as they directly transform solar radiation into electricity. See the interactive graph below for more statistics on solar power in the world.
How does the sun sustain itself?
It's a massive collection of gas, mostly hydrogen and helium. Because it is so massive, it has immense gravity, enough gravitational force to hold all of that hydrogen and helium together (and to hold all of the planets in their orbits around the sun).
What are two methods for using solar energy?
There are two main types of solar energy technologies—photovoltaics (PV) and concentrating solar-thermal power (CSP).
What are two ways to collect solar energy?
There are three primary technologies by which solar energy is harnessed: photovoltaics (PV), which directly convert light to electricity; concentrating solar power (CSP), which uses heat from the sun (thermal energy) to drive utility-scale, electric turbines; and solar heating and cooling (SHC) systems, which collect ...
What year will the Sun explode?
Scientists have conducted a lot of researches and study to estimate that the Sun is not going to explode for another 5 to 7 billion years. When the Sun does cease to exist, it will first expand in size and use up all the hydrogen present at its core, and then eventually shrink down and become a dying star.
How does the Sun keep burning without oxygen?
The Sun does not "burn", like we think of logs in a fire or paper burning. The Sun glows because it is a very big ball of gas, and a process called nuclear fusion is taking place in its core. ... Hydrogen really doesn't burn, it fuses, into helium. So no oxygen is required!
What happens when sun dies?
In five billion years, the sun is expected to expand, becoming what is known as a red giant. “In this process of the sun becoming a red giant, it's likely going to obliterate the inner planets … ... Once the sun completely runs out fuel, it will contract into a cold corpse of a star – a white dwarf.
What is the main source of solar energy?
Answer: The main source of solar energy is the SUN. Energy is produced by nuclear fusion in the core region through a series of steps called the p–p (proton–proton) chain in the surface of the sun; this process converts hydrogen into helium and massive light and heat energies.
How long will the Earth last?
By that point, all life on Earth will be extinct. The most probable fate of the planet is absorption by the Sun in about 7.5 billion years, after the star has entered the red giant phase and expanded beyond the planet's current orbit.
Can a black hole happen on Earth?
In order for a black hole to affect Earth, it needs to be so close to the solar system, which rarely happens. Even if our Sun is replaced by a black hole with the same mass, Earth would totally be in its normal position as the black hole will keep the same gravity as the Sun.
Will Sun become a black hole?
Will the Sun become a black hole? No, it's too small for that! The Sun would need to be about 20 times more massive to end its life as a black hole. ... In some 6 billion years it will end up as a white dwarf — a small, dense remnant of a star that glows from leftover heat.
What keeps sun burning?
The sun gets so hot from its nuclear fusion that it glows and emits light, just like how a piece of metal glows red if you heat it up. There are two main forces at work in nuclear fusion: the electromagnetic force and the strong nuclear force.
How can the sun burn for so long?
The efficiency of thermonuclear fusion is a major reason the sun has kept radiating heat for so long—the energy released by turning just one kilogram of hydrogen into helium is the same as burning 20,000 metric tons of coal.
Will the sun ever burn out?
Eventually, the fuel of the sun - hydrogen - will run out. When this happens, the sun will begin to die. But don't worry, this should not happen for about 5 billion years. After the hydrogen runs out, there will be a period of 2-3 billion years whereby the sun will go through the phases of star death.
