![]() Because of this new knowledge, we now have provisional answers to the second and third origin question. ![]() In this same decade, new types of telescope have allowed us to penetrate through clouds of interstellar dust to see the first moments in the life of a star, and also to see directly (not infer) what galaxies looked like thirteen billion years ago, only a billion years after the Big Bang. Now we know of over a hundred, and this knowledge has helped to reveal how planetary systems form. As recently as 1995 we knew of only one planetary system: our own. In the last decade, there has been a revolution in observational astronomy, which has meant that we are very close to answering three of the four big ‘origin questions’, of how the planets, stars, galaxies, and the universe itself were formed.
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