I don't know but here is a pic of a ninja
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The Earth is thought to have formed about 4.5 billion years ago, sometime shortly after the formation of the Sun. The Earth and other planets are believed to have originated as a disc of matter travelling too quickly to be captured into the mass of the Sun. Perturbations in the disc resulted in clumps of heavier elements which became the planets and asteroids. Farther from the Sun, clumps also coalesced into icy dwarf planets, and into comets.
Unfortunately your question is redundant; matter causes mass. The answer is that the smallest unit would be any subatomic particle (proton, antiproton, Tau, muon, and even an electron but only slightly). Then there are atoms and other than that, diatomic molecules (normal matter or dark matter) would be next.
Gravitational pull from the center of the galaxy, a dense object that causes matter around it to orbit in a orbital fashion.
Well what the problem is really adressing is what force causes the accumulation of matter or the nebulae to form stars. Simply gravity. The nebulae collapes due to a concentrated point of gravity. All that matter collapes into a star. So the answer is gravity.
it means, outside appearance does'nt matter , what important is what in ones heart.
Energy
Because multiplication is commutative. The order of the factors doesn't matter, the product will be the same.
Cold causes matter to contract. Heat causes matter to expand.
Consistency. Your ability to stay on point on a consistent basis will matter much more than any other factor.
The birth of a solar system begins with the birth of a star. When a star is forming, matter around the star begins to rotate, eventually forming into a disk, called an Accretion Disk. Over time, the matter in this disk collides and clumps up into larger clumps off matter. Sometimes you get gas giants such as Jupiter and Saturn. Other times, clumps of rock collide and grow until you get planets such as the Earth and Mars. So the straight answer to your question is: Solar systems form because of the natural tendency of matter to accumulate and begin rotating around a newly forming star.
Earth, like all planets, was formed by clumps of matter joining together due to gravity.
No
no it does not matter what two factors you select to complete a factor tree (i just learned that today in class :D)
No.
Heat energy causes matter to melt. The energy breaks bonds in the matter making looser constructions of the material.
NO
No.