Why does the Sun have radiation?

Sun is a huge ball of mass of hydrogen. So huge that the weight of the outer layers is crushing the mass at the center. The pressure experienced by the matter at the center causes some hydrogen atoms to fuse, forming the next heavier element Helium. So outer layers is converting hydrogen into helium

Have we ever sent space probes to examine our Sun?

Adding to Alec Cawley's answer to Have we ever sent space probes to examine our Sun?the two Helios (spacecraft) - Wikipedia were launched in 1974 and 1976 to study the Sun. They are no longer operational, but they were notable because they are

Have we ever sent space probes to examine our Sun?

Adding to Alec Cawley's answer to Have we ever sent space probes to examine our Sun?the two Helios (spacecraft) - Wikipedia were launched in 1974 and 1976 to study the Sun. They are no longer operational, but they were notable because they are

Why don't we send nuclear waste into the Sun apart from risks at launch?

Because there is no valid reason to do so. There are very good reasons to leave highly radioactive materials alone. We may need them sometime in the future. They are not harming anyone where they sit. The radioactivity naturally declines

For how many days can humans survive without the sun?

It's difficult to calculate exactly how many days we can survive but one alternative source of energy which can be considered is the earth's core.Without the sun the plants will be the first to die and that will kill all the animals dependent on

What time is taken by light to reach the Moon's surface from the Sun?

There is not much of a difference between the solar light reaching earth and reaching the moon. The only difference is that during the New Moon the solar light takes 20 seconds less while during the Full Moon it takes

What happens to the tail of a comet when it moves far away from the Sun?

The tail of the comet is gas and dust boiled off by the heat if the sun. So no new tail material is emitted once it gets away from the sun. The material emitted near the sun goes into its own orbit, similar to

How would you put out the sun?

First you need to understand what the sun is: a giant nuclear fusion reactor. The energy to start the reactions comes from the pressure given by the sun's own gravity. So if you want to put out the sun, there are a couple of things you could do.One, you would need

Why does it take so long for the moon to rotate around the sun?

The Moon does not really rotate around the Sun.The Moon orbits the Earth about once a month and rotates about its own axis also about once a month, thereby keeping on face towards. This is called tidal locking. The Earth and Moon pair also orbit around the Sun at a rate of

Do you think there will be life on Earth to see the day the sun dies?

No Earth's life from beginning to it's end is 2billion years it's roughly just passed 1billion years. The sun has approximately 25 - 35 billion year life expectancy.

If the Sun's gravity is constantly pulling planets toward it, why hasn't the Earth been pulled into the Sun?

Answer 1:The Earth is always being pulled towards the Sun by gravity. If the Earth were stationary compared to the Sun, it would fall into the sun under the force of gravity. However the Earth is actually moving sideways compared to the center of the Sun at 3 km/second (~2 miles/second). The Earth is not

Is the Sun a double star?

As far as we can tell, no.There was the Nemesis hypothesis, which used data regarding extinction-level astronomical events to conclude that they happened at a regular time, indicating that perhaps the Sun had a companion, either a very large Jupiter-sized planet or brown dwarf (most likely nothing larger).However, the WISE (Wide-field Infrared Survey Explorer) mission eliminated

How could anything burn this long like the sun?

well it is a giant nuclear reaction, creates a huge gravitational field which holds the nuclear reaction together at a point, it like fuel in a bottle the bottle(gravity) stops it from losing mass too fast, the fuel works till it depleted. but to put it in simple terms the sun is really really

What are humans going to do when the sun turns into a red giant and eat/burn our polluted planet?

From what I've read, jury is still out on whether or not the Earth itself will be completely destroyed when the sun becomes a red giant. First, the Earth will be farther away from the sun by then (5 or so billion years from now), second, red giant stars can be pretty nebulous so it's

What makes it possible for the planets to continue to orbit the sun without falling off their orbits?

The lack of anything stopping them from continuing to orbit the Sun.Newton's First Law

Will Mars survive the death of the sun?

One theory is that as the sun leaves the main sequence and becomes a red giant, there is a time when the sun will loose some of its mass.The planets are where they are currently due to the current mass of the sun and when this mass is decreased, the gravity influence of the sun will

Will Earth fall into the sun?

-The better way is to say that earth will be swallowed by sun.-As per the theory of relativity, the earth will follow a spiral path ending in the sun because of the bent in space fabric caused by sun. But this will be a very slow process-many years before that

What would happen if a neutron star approached the sun? What would happen to the sun?

IANAA (I am Not an Astronomer) but here is my layman's understanding of the consequences.The initial state of the situation would be that the neutron star would be passing through the solar system on a hyperbolic trajectory. In other words, it isn't in a closed orbit, and it's

What would be a way to explore others sun systems?

Only by big telescopes, anything else is unfeasible. Reaching a different stellar system will take to the order of ten thousand years. Our civilization won't exist anymore on that time scale. Also currently there exists no technology that will survive a hundred centuries. It is inconceivable that such a technology will

How would the earth be affected if the sun suddenly disappeared?

If sun disappeared the consequences would be pretty dire. But our planet retains heat rather well, so we wouldn't freeze to death instantly.Those on the night side wouldn't feel much difference initially but eventually the lack of the

The planets of our solar system revolve around the sun. But why isn't it that they get attracted to the Sun and just fall into it?

Planets revolve around Sun with specific speed or more accurately velocity. The velocity of the planets keep them intact in their position. If the speed was less or zero, Sun would have attracted the planet to itself and if the speed was higher

How will the sun be a red giant?

After about 5 billion years most of the hydrogen will finish.The mass will be reduced.But helium fusion will continue.After a

What would happen if Jupiter were to suddenly turn into a star the size of the Sun?

Nothing much.Jupiter is over 5 times as far from Earth as the Sun, at best.The light we would receive from this new Sun would be 1/27th that received from the Sun, again, at most.The gravity we would experience from the new Sun would be 1/27th that we do

Where does the sun go when it goes down? How does the night sky show?

The Sun does not ‘go down'; we, on Earth, just rotate away from it. The Sun can be considered to be stationary. At night, without the Sun lighting up our atmosphere, the stars are revealed. They were there all the time, shining just as at night, except now

Using technology, could we stop the sun from scorching the earth 500 million years from now?

I just read an interesting suggestion that Robert Walker mentions--using asteroids to slingshot around the Earth in such a way as to increase our orbital distance from the Sun.  How many asteroids this would take, I don't know, and uh-oh if someone

What would happen if the Sun stopped emitting visible light?

Photosynthesis becomes impossible, because all the remaining eligible wavelengths are caught by the ozone layer (somebody correct me if I'm wrong)That leads to total death, even if the Earth doesn't actually cool down. Though I suspect it will: visible light gives quite a bit of the thermal energy input.I mean, microbial life could survive (and stuff

What would happen if a hypervelocity star hit our Sun?

BOOM!A direct hit would probably smash both stars, dispersing the gas over a large volume. It could be that this gas would recollect into a new star.The chance of this happening? ZERO (for all intents and purposes).It's not easy to imagine how vast space is, and how teeny a

For how long sun will survive?

It'll burn like we see for about 4.5 billion more years. Over that time, it'll slowly brighten, and in about 1.5 billion years, it's output will be great enough that life on Earth will no longer be possible.At the end of it's life on the

Is the Sun expanding? Will it ever explode?

Until the sun turns into a red giant it actually contracts.Once the core of the sun stops its fusion process of hydrogen it will slowly contract while the outer layers expand due to the continued fusion process.However, due to the cores contraction it starts to become very hot, which in turn causes it to then expand.When it

If our Sun had to look like a regular star on planet Earth's night sky, then how far away would Earth need to be?

The sun is now about on 150000000 km  from us. If it had to look like a regular star on earth's night sky, then it would have to go 10 thousand light years far from us. 1 Light year is about 9.4605284 × 10^15 meters. Then you can calculate the distance between earth and an average star.

Why do we classify sun as a star?

Because our sun IS a star! That is, it is a big ball of - mostly - hydrogen gas, compressing to helium at its core and releasing energy in the process. The outward pressure of this reaction (known as fusion) is exactly

How is life possible on Earth because of the sun?

Without the sun, Earth would be too cold to inhabit.

How come the heat from the Sun hits the Earth roughly the same time as the light from the Sun?

The light from the sun also creates the heat that you are asking about. The photons hit the Earth and the molecules that make up the Earth are excited and start to move increasing their temperature. It may take sunlight a bit of time to

Why can't we touch the sun?

Well....the temperature at the surface of the sun is about 5778 K. This temperature will be sufficient to vaporize the whole of human body. In fact you would be vapoirized long before you even reach the sun. Apart from this you will also have to face the solar winds, which would be enough to

What if Earth had a red sun?

Then earth would've been more like this..

Could life on Earth survive if the sun was destroyed?

I'm not sure why we're not answering the literal question asked. The question wasn't

How much time does it take for sunlight to reach the Moon?

Frankly you should be able to calculate such things yourself. You know the distance to the Sun, the distance to the Moon. The distance between Sun and Moon varies depending on which side of the Earth the Moon is on. On a NEW MOON, the Moon is between Sun and Earth; on a FULL MOON the Earth is

Why is the Sun a small star?

It's not a small star until you start comparing it with other bodies like Canis Majoris. We are the proud owners of a medium class star. One that has a solid core burning hydrogen into helium and trapping it there until it's moved on to Carbon where the pressure

What is the difference would it make if the Sun disappears someday?

If sun disappears, then the entire planets will go haywire since sun's gravity holds them in place. If the sun were replaced by a black hole with the same mass as the sun, every thing will remain the same as it is now, except for the

Could life on Earth survive if the Sun's luminosity increased by 1%?

Q: Could life on Earth survive if the Sun's luminosity increased by 1%?Probably, yes. Not all life, and possibly not humans, but a lot of life forms, sure.The current climate change we are experiencing is of course already a major

What happens to the sun if it had no earth?

It's the life in the earth that glorifies the Sun.Without earth what glory can be attributed to sun?None.Hence without earthlings, sun would be just another insignificant normal star floating around in the infinite vastness of the cosmos.

Is the sun going to explode in a couple hundred thousand years?

No, in fact the Sun won't explode at all! It doesn't have the mass necessary to explode as a supernova/hypernova/kilonova.At one solar mass, the Sun will go through a series of phases, ultimately ending as a white dwarf. Over the next

If our sun was red instead of yellow, could humans survive on Earth?

If our sun were red instead of yellow, could humans survive on Earth?If our sun were red instead of yellow, humans probably wouldn't have evolved in the first place.A cool, red star emits substantially less UV light than a hotter star. A substantial percentage of mutations are caused by UV light. It takes