Is matter or radiation more important in determining the final fate of the universe?

Question

How long will life as we know it exist? As to your first answer, what is the ultimate fate of the known universe?

Answer 1

Matter is what should determine the ultimate fate of the universe. Mass has gravity, so the more mass there is the more gravity there will be. If there's enough mass in the universe it should some day stop expanding and collapse back on itself.

However, such doesn't seem to be what's actually going on since we now know that the universe is expanding *faster* rather than slowing down due to the presence of mass (..gravity..) Why this is so isn't known at this time.

All research, such as the WMAP program, strongly implies that the universe will continue to expand indefinitely.

As far as how long life as we know it will exist, that's hard to say since we have the capability to destroy all life on planet Earth. Another huge asteroid could come along and impact Earth, like the one that wiped out the dinosaurs and 60% of all life on Earth about 65-million years ago. Also, there's a star within 150 light years of Earth that could possibly go supernova and bathe Earth in deadly radiation (..http://www.newscientist.com/article.ns?id=dn2311..) Finally, the time will come in about 4-billion years when our Sun will become very unstable, expanding immensely and engulfing Mercury, Venus, and possibly Earth. At that time no life could continue here.

Answer 2

How many different questions can you ask at one time?
1.
Life as we know it may cease to exist in the next 200-500 years if the hairless apes don't smarten up and stop defficating in their own food bowl.

2.
I take it you mean all forms of energy, not just radiation. And E still = MC^2

Matter would still "matter" more (see links).

There are stars as large as our solar system which contain and emit immense amounts of energy. Blackholes are a fraction of the size of Earth and can eat stars. Matter and the gravitiation force created will have more effect on the end of the universe than energy, though it is all about energy balance, since matter and energy are interchangeable..

The universe is accepted as being created in the Big Bang and if they ever figure out how to measure dark matter they expect to calculate that eventually the universe will collapse back on itself and create another Big Bang ad infinitum.

In other words, before the Big Bang ... there may have been a universe that was destroyed to create our universe. And in turn ours may end so that a new universe will be created.

Answer 3

Radiation is the more important.
Mass can only be used locally but radiation can gives us information from all parts of the universe.
Life could go on for billions of years on earth.
Intelligent,objective and technological life like man will probably be limited to 300 to 500 years.
The universe is a finite entity and one day it will go out of existence.
The actual mechanism of it's demise is probably progressive in the evolution of galaxies.

Answer 4

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