?Why is our solar system in a disk shape.?

Answer 1

It is a disk shape for the same reason a pizza becomes disk shaped as you spin it. The middle part is going faster than the top and bottom so it pulls out into a disk shape.

Answer 2

In addition to the Sun's gravity, all the debris in the solar disk had gravity too. In orbiting the Sun, these particles had an influence on each other, tending to pull them into alignment and eventually stable orbits. Even now it's not perfect, but the large planets are all very close to the plane of the ecliptic because of their pull on each other.

A planet with an orbit inclined too far is more susceptible to instability when it passes through the more heavily populated ecliptic, where the influence of gravity is more predominant. If it can't achieve a stable orbit, it's either flung out of the system or crashes into something. Pluto is an example of stability. Its orbit is such that whenever it crosses Neptune's orbit, it is never close enough to be pulled off course. If it were otherwise, we'd have probably never known it had been there.

Answer 3

Our solar system began about 4.6 billion years ago when a cloud of dust and hydrogen gas drifting in our galaxy began to condense. The condensing mass of material was rotating and it formed a wide, flat disk as it turned. Most of the material collected in the center, where temperatures and pressures eventually increased to the point that nuclear fusion began to occur. In this way, our Sun, the central star of our solar system, formed. Dust and gas particles in the wide disk continued to swirl around the Sun, occasionally colliding and merging. Through this process, called “accretion,” these microscopic particles formed larger and larger bodies — eventually becoming planets. In the inner, hotter part of our solar system more materials such as silicates and metals concentrated. Our rocky inner terrestrial planets — Mercury, Venus, Earth, and Mars — were formed of these materials. In the outer, cooler portion of the solar system other materials such as water ice and gases were able to accumulate onto the giant planets. Our outer gas giant planets — Jupiter, Saturn, Uranus, and Neptune — formed from these materials. These are planets with small icy rocky cores surrounded by thick accumulations of gases. Pluto, a tiny icy planet, is the largest of the Kuiper belt objects. The Kuiper belt lies beyond the orbit of Neptune and contains icy rocky remnants from the formation of our solar system.

Answer 4

Kepler's first law of planetary motion. All satellites revolve in eliptical orbits around a focus. For our solar system the focus is the sun, and gravity w/ tangential speed and escape speed keeps everything revolving in an ecliptical motion around the sun. This is the same principle that holds smaller satellites, i.e. the Moon to revolve around the Earth. Imagine it as the Moon is falling around the Earth. The Tangential speed and gravity keep it revolving without crashing into it.

Answer 5

There is believed to be a black hole at the center of our galaxy. When that black hole is active, it causes energy to be thrown from the black hole. This clears away all matter in the way of the energy. This is why our galaxy isn't an orb; the energy cleared away all of the matter on both sides.

p.s. There is no centrifugal force; when people say there is, they haven't studied physics properly. Centripetal force is an inward force e.g. gravity or tension, but centrifugal force isn't a force that exists on its own.

Answer 6

the suns gravitational pull is strongest in the middle of its sphere. Also centrifical force. Tie rope to a golf ball and spin around your finger. Pretend your finger is the sun spinning. Tension pulls the golf ball into a straight line. Now tie another rope to the golf ball to an orange. Now spinning around your finger is a golf ball and an orange, in a fairly straight line.