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It could be many things such as planets, dormant stars, or black holes, but we are seeking the truth... What do we need to know about Dark Matter that we dont?

Is there any significant information about how it differs from the matter on earth?

Knowing Kepler's Laws and the velocities of stars in a galaxy or galaxies in a cluster, it is easy to figure out the mass necessary to keep the galaxy or cluster from flying apart.

But when astronomers add up the mass of everything they can see with their telescopes, the mass of the Universe comes out to only 1-2% of the mass revealed by the law of gravity.

Answer 1:well frankly kids, no one KNOWS what dark matter IS. By careful study of the dynamics of galaxies and the motions of stars astronomers can deduce the presence of mass by the gravitational effects it has on luminous matter(like stars).there are some very exotic and very mundane proposals (hypotheses) that are promulgated. Everything from some weird attribute of STRING theory to mundane black dwarf stars..rogue planets, as well as what you is an interesting and open question that is getting a lot of interest from researchers.

Answer 2: The truth is, nobody knows what most of the dark matter is.

The rest is the mysterious, invisible Dark Matter, which makes it's presence known only through it's gravitational pull.

Surely, some of the dark matter is just ordinary atoms in the form of dead or stillborn stars, thin gas, and black holes (Black holes aren't made of atoms, but they grow by feasting on atoms, so for the purposes of this argument it's as if they were made of atoms).The size is so large that the rotation period is tens or even hundreds of millions of years.If there were no dark matter, each star would orbit the center of mass of the galaxy more or less independent of the others -- this is because the distances between the stars are so vast.Measurements of velocity distributions (made by spectroscopic analysis) for typical galaxies show that the galaxy rotates as if it were embedded in a "soup" of uniform density -- i.e.that there is something with a mass comparable to the galaxy which doesn't show up on the photos -- i.e. It has also recently been found that a large number of galaxies have black holes in their centers (or close)which does add substantial mass to the galaxy, but only makes the velocity distribution worse. Machos (sub-stellar mass dark bodies of ordinary matter -- distributed fairly uniformly in the galaxy halo.2.We have a good idea of the number of protons and neutrons in the early universe because their density affects the abundance of light elements.

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