describe how matter and the planets were formed?

There was this big bang thing like right. Observational evidence for the Big Bang right, like seeing it like, includes the analysis of the spectrum of light, which is that stuff that kinda lets us see things yeah, from galaxies which reveal a shift towards longer wavelengths proportional to each galaxy's distance in a relationship described by Hubble's law (he was that bloke that made that telescope thing). Combined with the assumption that observers (people what see things like) anywhere in the universe would make similar observations (the Copernican principle), this suggests that space itself is expanding. Extrapolation of this expansion back in time yields a state in the distant past in which all matter and energy was at an immense temperature and density. This really really boiling hot, dense state is the key premise of the Big Bang.

Extrapolation of the expansion of the universe backwards in time using general relativity right, yields an infinite density and temperature at a finite time in the past like. This singularity signals the breakdown of general relativity (bugger). How closely we can extrapolate towards the singularity is debated, certainly not earlier than the Planck epoch (Planck got a bit board I reckon). The early hot, dense phase is itself referred to as "the Big Bang", and is considered the "birth" of our universe. Then things kinda went haywire for a few nanoseconds right. After a few minutes the new universe right, had cooled, like you know not as hot yeah, to a billion kelvin (still hotter than Blackpool in the summer though). As the universe cooled like even more (but still hotter than Blackpool yeah), the mass energy density of matter came to gravitationally dominate that of the photon radiation yeah. After about 380,000 years (older than my Dad!) the electrons and nuclei combined into atoms (mostly hydrogen); hence the radiation decoupled from matter yeah, and continued through space largely unimpeded (cos like there wasn't much else in the way). The relic radiation is the cosmic microwave background. Over time, like lots of it, the slightly denser regions of the nearly uniformly distributed matter gravitationally attracted nearby matter and thus (I'd been trying to get a "thus" in somewhere!) grew even denser, forming gas clouds, stars, galaxies, and the other astronomical structures observable today. Phew.

I assume it's for a physics class, right? So God is out of the picture.

When a star dies, it can explode into a cloud of gases (that also contain heavy elements like iron in atomic form) that can condense into dust. If the cloud of dust enters the gravitational field of another young star (let's call it sun from now on), the dust will arrange itself in a ring shape at a certain distance of the sun (kinda like the rings around Saturn). With time, the dust on the ring condenses into rocks, and rocks assemble to form a planet.

Depending on the amount of matter (gas or dust) accumulated, and the distance from the star (sun), you'll get either a rocky planet (like Earth or Mars) or a gaseous planet (like Saturn or Jupiter).

I hope I helped and did not upset too many Astrophysicists or religious fanatics ;)

Matter was theoretically formed at the instant of the Big Bang, mostly just Hydrogen, although some Helium and Lithium formed as well, subsequent generations of hypermassive stars and the associated supernovas created ALL the heavier elements. Planets formed from the gradual accumulation of dust grains.

lets take a guess being as we don't really know lol.......good question by the way......imagine an atom that does not have two parts but three and at some time for reasons unknown that third part was forced out ..because atoms are everywhere they forced that third body away from themselves thus the third body formed the planets by being crushed together by force and and that third body acted just like an atom where the active stuff was in the middle and can,t escape but occasionally it bursts out and is forced back thus forming new land....the world tries to explode outwards but is contained by the force of atoms we call gravity.....OK drank too much wine lol...enough

All matter was spontaneously created directly or as a result of the 'big bang'. What caused the big bang is the real question. A divine hand or just 'one of those things'. Your answer is as good as anybody else's, if you can supply supporting evidence

Early stars made of hydrogen burned brightly and generated all the elements that we have. Then they exploded and sent the wreckage all over the universe. The star dust condensed and made more stars and the planets like ours.

God...anymore questions refer to the Bible.

in the beginning God made the heavens....Genesis, The Bible...

God

what at this hour of night .....................