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

Will humans ever be able to find out what is on the other side of a black hole/singularity?

There isn't another side of a black hole. A black hole is a place where gravity is so strong that all matter is compressed to the smallest size possible - probably something called the ‘Planck Length'. That's it! In real black holes there aren't other sides, or gateways - only an unimaginably

What is the most mind-blowing space documentary you have ever seen?

Thats an easy one. Any one of the four hours of the series:

What is the most mind-blowing space documentary you have ever seen?

Thats an easy one. Any one of the four hours of the series:

Can you blow my mind with a space fact?

How about this:Stand outside, perfectly still, and look around you. Leaves flutter in the breeze, cars drive by, birds flit through the air, and yet you are perfectly motionless amidst all that activity.But are you really? At that very moment, you are standing on the

Can you blow my mind with a space fact?

How about this:Stand outside, perfectly still, and look around you. Leaves flutter in the breeze, cars drive by, birds flit through the air, and yet you are perfectly motionless amidst all that activity.But are you really? At that very moment, you are standing on the

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

Why does NASA have to destroy Cassini?

NASA's Cassini spacecraft has been vaporized. The probe dove into Saturn's upper atmosphere this morning, and NASA lost the vehicle's signal at 7:55AM ET, indicating it had broken apart irrevocably during its rapid descent toward the planet. Cassini's demise officially puts an end to the probe's 13-year mission at

Why in astronomy is distance measured in light 'years'?

The distances which we measure in the outer space are huge. The distance on the earth are relatively small so we measure all the distance in Km, miles or meters.  To give you a simple idea the distance from earth to moon is roughly: 384,400

What effects would missiles have on a meteor falling to Earth?

Let's look at a realistic example, the Chelyabinsk meteor - Wikipedia.This object came into the atmosphere at 60,000–69,000 km/h (40,000–42,900 mph). It was over 60 feet across. It fragmented violently due to external heating while still at an altitude of around 29.7 km (18.5

In which direction of the sky is the universe's expansion pointing, seen from our vantage point?

No matter where an observer is in the observable universe, the expansion is the same in all directions. I'm not saying that we on Earth are in a special position from which the expansion is everywhere away from us. The

What are your thoughts on the NBC article stating the Oumuamua object may have been an alien probe?

I think that they are full of unfounded crap which they have to say because unless it's about aliens, bigfoot, nessie or some other happy crap they figure the average, ignorant doof on the street cannot possibly be interested.They are talking

Why can't you see stars in videos of space?

Try it yourself. Get any video camera (a phone will do) and film a friend, lit enough so that the camera can see them, with the night sky as the background.Notice the total lack of stars in the video.Start a conspiracy theory as to how the video was faked.

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

Do you believe in the possibility of extraterrestrial life?

Do you believe in aliens and why?I belive intelligent life exist elswere in the universe but i dont belive they are visiting the earthThere are millions of galaxies out there. with millions of solar systems each. to belive that there is no other planet among the untold billions of planets that exist that

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 our moon was bigger, how would it affect Earth?

Well considering that moon was (in past) part of earth, if moon would have been bigger then, earth size would have a big small, so do earth's gravity, so do our bone density and many biological functions, tides on earth would been even bigger because

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 there a ratio between how many stars and galaxies we see in the night sky?

The ratio of naked-eye stars to galaxies, in each hemisphere, is about 1500 to one.  On a cloudless moonless night, with low light-pollution and clear horizons, you can see about 3000 stars from any particular place. There are a total of about 6000 for the whole planet. There

Could we ever live on the moons of Jupiter?

Yes, the innermost Jovan moons will be in the radiation belts of Jupiter but the mid to outer moons will be suitable for human habitation.

What would happen if a neutron star was a cube?

There is no way it could be shaped into a cube. None at all. Neutrons can't be manipulated at the macroscopic scale by anything but gravity. And using gravity strong enough to reshape the neutron star would just tear it apart, sucking it into the black holes you were using.

Which star appears in the sky as the star which all other stars revolve around?

Jules Stoop is correct on both counts, however, on the second count, he has not mentioned the second one.Which star appears in the sky as the star which all other stars revolve around?There are two stars around which it appears the other stars are revolving around, Circumpolar star. In the northern

Which is the biggest planet in our Solar System?

Nobody knows for sure, though the largest planet we know so far is Jupiter, by far. The Kuiper belt is vast and Oort cloud even vaster.Jupiter is definitely the largest planet that's anywhere near Earth, indeed we know that there is no largert planet right out to 26,000 times the distance from the Sun to the Earth (26,000 au)

How long would it take to travel to the super earth Kepler-452b?

Using current technology of rockets and spacecrafts the trip is impossible, no matter what is on the drawing boards.  The trip itself is not impossible for humans; just using current space technology makes it that way.  The only other thing that makes it impossible, is physics silly solution to real teleportation; the Star Trek methodology of scanning/decoding

Is it possible to plant life on another planet?

You have raised an important and interesting point.Planting life (microorganisms to start) with is pretty simple given the fact that man landed on moon way back in 1968 or so and now man has send probes that are bringing back soil/rock samples etc

How much time do all planets take to complete one revolution round the sun?

If you want to know the values you can google them. The values you will get will be according to earth's time. 24 hours is a repetitive phenomena on earth. Suppose we are living on mars the we would say that earth complete its revulotion faster then mars. Main

What if we had more than 1 Moon? How would it affect or change Earth?

Who says we don't have more moons?A definition of "moon" according to the OED, says that it is any "natural" object orbiting a planet.Currently, there is a "mystery" object orbiting Earth, temporarily designated 9U01FF6, with an orbital distance between 50,000 and 460,000 miles and

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

In interstellar, wasn't the future earth still more habitable than the alien planets they discovered?

Maybe it was habitable for a little while until the crew found a new planet in the foreign galaxy, but in that short while things on Earth started getting progressively worse.There were two reasons for this decline:1) The fact that

How is the Universe 13.4 billions years old and at the same time its approximate diameter is more than 90 billion light years?

The 90 billion lightyears number is actually 93 billion lightyears and that is the size of the observable universe and not the size of the whole universe. The observable universe is only part of the whole universe which is most likely infinitely large.Still, the question remains, how can the observable universe be so large if it only got

Can we ever see the universe beyond 13.8 billion light years from our position?

If you look at something from two positions it appears to shift by some angle depending an how far away it is and the length of your baseline. If you look from opposite sides of the Earth's orbit, that is the longest baseline we

Are there any celestial bodies that we can see in the night sky without a telescope?

Other than the Moon, Sun, Planets, and many stars, off the top of my head:M45/Pleiades; The Hyades: Two open star clusters in Taurus, the brightest members of which are easily seen with the naked eyeM42/Great Orion Nebula: visible as a fuzzy patch in the sword of OrionM31/Andromeda Galaxy - visible as a fuzzy patch from

Is it possible that the probability of life spontaneously appearing is so low that Earth is the only planet in the Galaxy (or in the observable universe) in which it has happened?

Is it possible that the probability of life spontaneously appearing is so low that Earth is the only planet in the Galaxy (or in the observable universe) in which it has happened?I am not a statistician, or a mathematician. All I can do is read. However, it seems, from what I do read, that the odds of

When the light from all the stars in space finally reaches Earth, will the night sky be as bright as day?

The night sky will never be as bright as day. Though the reasons are somewhat more complex than the reasoning of the question.The most distant light arriving at Earth is the Cosmic microwave background and it is

Are there other planets with life on them?

We don't have a clue. May be billions. Or may be none. It's all conjecture until we have a fundamental understanding of how life can result from non-life. If it takes extremely fine tuning, then it's possible that only earth has the specific

What will earth be like in one billion years?

Bear with me here while I share my perspective...Man has a propensity for scientific advancement, engineering, war and revenge like no other life on this planet...we continue to develop weapons of incredible (and increasing) power with each advancement in understanding. With each advancment we

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