Dark matter
Dark matter is the form of matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can be inferred from gravitational effects on visible matter. An example be holding to of the same magnets(Positive and a positive) and watching them unable to connect with each. This is not black matter but it is a simple explanation for it.
Dark energy
Dark energy is the theory to explain the apparent rapid expansion of the universe. There is much evidence for the presence of dark energy but little is known of its nature.
Andromeda Galaxy
This is our spiral neighor galaxy. It is bigger than ours and some of its stars can be seen in the andromeda constallation.
Xena
Planet Xena is an orb circling the sun that was first discovered in 2003. Its official name at this point is UB313.
Nebulae
Its a cloud of gases and/or dust resulting from a star explosion.
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