Limited Options

Just because the universe is expanding now doesn't necessarily mean that it will go on expanding forever. The expansion started with the Big Bang is opposed by a relentless force that we have met many times before in this book—gravity. The universe has a couple of options, and it all depends on how much stuff (mass) there is in the universe. Perhaps young Alvy would have been even more worried if his mother had told him about the other possibilities.

There are basically three options: The universe will either expand forever (be unbound), or it will continually slow in its expansion but never stop (be marginally bound), or it will reach a certain size and then begin to contract (be bound).

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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