Why are all the planets shown as spheres..why r they round?

Question

If the big bang theory is the answer fragments would not be round

Answer 1

Bodies in the universe tend to evolve towards minimun energy
states. On the other hand, spheres are the geometrical shapes whose volume/area ratio is lower, I mean: a sphere can contain more volume within that any other shape with the same area. That makes them more stable than any other kind of figure, since the more area you have more energy you need to keep the body bound together. That is why planets, during formation, adopt spherical shapes.
You can observe that in water drops. When a portion of water falls from the tap, it tends to form a spherical drop for the same reason.

Answer 2

First the big bang theory is not a theory of how the solar system formed, it is a theory on how the universe formed... after the big bang there was just a super high energy plasma like state, everthing was uniform... once things cooled off and the universe began to expand a little... things began to clump together from the force of gravity some areas became so dence that solar nuclear reactions started and the first suns/stars where born(this was a long time before our sun had even been born) some suns/stars got so dence that they exploded under the force of their own gravity in a cenario know as a super nova, flinging particals to other far out reaches of space... this kind of activity happened for a long time before our sun came along... it formed from the remans of this dust from super nova and dead stars, most matter clumped to the center and once reached critical mass our sun was born and ingnited for the first time. there was some matter that did not quite make it to the center of the sun though, a haze of particals circled around it spining around fast enough to counteract the force of the suns gravity.... those particals clumped together as they spun around the sun, millions of years more and more clumping, and spinning... after all that spinning and clumping most of the celistial bodys end up as a round shape, although some celestial bodys do have a more rocky formation to them, mainly becuase they are too small and too far away for the rounding process to take place... pluto, and other large objects in what is known as the Kiper belt look like this... hope this helps! email me or messge me with any questions

Answer 3

All objects 'possess gravity'. An object's gravitational attraction spreads out equally in all directions. The strength of that attraction is inversely proportional to the square of the distance from that object. Since the force is spread out in all directions, all spots that are an equal distance away experience the same gravitational force. In other words, the gravitational force created by an object is spherical in shape.

If two molecules of about the same mass clump together, their combined gravitational attraction is twice as big because gravitational force is directly proportional to the mass of an object. Now the force is twice as strong and still spreads out in all directions equally.

The object is more likely to attract another molecule to 'clump together' with it than a single molecule. You can kind of get the picture where this leads. Once enough mass has clumped together, the object becomes the dominant 'attractor' in the area. All new attracted objects get pulled as close as possible to the center of the attracter until they encounter some obstacle (mass that was previously collected). That means new mass will also be accumulated in a spherical shape. (It also means that, eventually, so much mass is accumulated that there is an incredible amount of pressure on mass located near the center of the object, since they are bearing the weight of all mass above it - that pressure creates the reactions that turn the object into a star).

Answer 4

Most planets are not perfect spheres. They do generally appear that way from a distance. They are generally spherical, and the most widely accepted theory is that it is due to the way that they were initially formed - gravity and spin combine to form a roughly spherical shape.

But planets and planetoids are not perfectly spherical, and this can be fairly easily seen - viewed through a telescope, for instance, you can see the Moon's "rough edges." Looking at a planet with an atmosphere, this is more difficult to see, because of the atmospheric effects on your sight.

Answer 5

When the planets were formed they were completely liquid .. think of them as big globs of lava ... as they spun around and around centrifugal force formed them into spheres .... this actually has no real relation to the big bang at all as the material that the planets are made of (and you, by the way) had already been through two or possibly three trips as part of earlier stars that combined simpler atoms into the more complex materials that form the modern planets. It is rather fun to think about the fact that you are made from stuff that used to be part of a star!

Answer 6

cos of the gravity bro! planets arnt totally sphere shaped, its the atmospheres that do it, but yeah theyre basically round cos gravity pulls sh*t in from every possible direction

Answer 7

The center of gravity pulls everything downwards, and that's what makes it rounds shaped.

Answer 8

gravity.. it pulls everything together. like droplets of water is round

Answer 9

it just is, like your eyes like flowers, like everything else we have no answers for.