The universe
How does the expansion of the universe make outer space a vacuum?
Its caused by gravity
Did the big bang make noise?
It was more akin to robotic humming
what is the smallest inner planet?
Mercury
What is the biggest outer planet?
Jupiter
How many stars are in a galaxy?
100 thousand million.
What is the universe made of?
dark energy, dark matter, and ordinary matter
Could we ever see all the way back to the Big Bang?
we can't see in lookback time earlier than that.
What is the biggest inner planet?
earth
what is a outer planet
a planet whose orbit lies outside the asteroid belt Jupiter, Saturn, Uranus, Neptune.
How old is the galaxy
13.61 billion years
Are there any other universes?
no, statically significant evidence have been found.
Did time run more slowly after the Big Bang due to gravity?
Time appeared to move 5 times more slowly in 1st billion years after Big Bang.
What are things the inner planets got in common?
they're solid, dense, rocky planets.
What is the smallest outer planet?
Uranus
what is a galaxy made of?
huge collection of gas, dust, and billions of stars and their solar systems.
What is the universe expanding into?
The Universe expands into itself, rather than into any definable “outside” medium.
If the Universe expands from the Big Bang, why isn't there an empty sphere at the centre?
the universe is simply expanding at all points.
What are the inner planets?
Mercury,Venus, Earth, and Mars.
What are the outer planets?
Jupiter, Saturn, Uranus, and Neptune
What is a galaxy?
a galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
How long will the universe exist?
In about 100 trillion years
What is the big bang theory
It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!
what is a inner planet?
What do the outer planets have in common?
thick gaseous outer layers and liquid interiors
How long does it take a galaxy to rotate?
about once every billion year