Astronomy concerns itself with the whole of the visible universe, of which our earth forms but a relatively insignificant part. This slide show is going bring you quite different perspective for your sense of existence.
If you haven’t visualized the vastness of space yet, you should have a look at the following amazing images by clicking the link below.
If you start to wonder how vast the universe, the other question which is still unanswered, crop in your mind is “Is there anybody out there?”. But a fitting reply for time being for this question is
“The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.” – Author: Bill Watterson