My teacher showed me a Youtube video about this dwarf star thingy. Should I be concerned? It looked serious.
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You seem to be referring to Comet Elenen. It is a rather small comet which will miss Earth by 22 million miles at closest. If you are the sort who thought the world would end this past weekend, and expect it to end in October as well as December 2012, you might as well waste time worrying about this also. Otherwise, hope for a comet we might be able to see, because this one will only be visible through a telescope.
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no don't worry about it because it is not coming very closer to earth
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no.