Prac One Flashcards
When did the universe begin?
13.4 billion years ago.
How many galaxies are there in the universe?
100,000,000 (100 million).
What is the vomit comet?
A plane designed to fall toward the Earth, making it passengers weightless for a few minutes.
Who was the first scientist to think about gravity?
Issak Newton.
What is the relationship between the force of gravity and the size of the object.
The bigger the object, the greater the gravitational pull.
How many faces of the moon do we see?
One
How large it the tidal bulge of the moon’s rock?
7 meters.
What is the name of our galaxy?
The Milky Way.
What type of telescope is the Very Large Array in New Mexico?
Radio telescope.
Which galaxy will out galaxy collide with in 3-4 billion years?
Andrometer.
How strong is the force of gravity on Jupiter?
2.5 G.
What G number are we adapted to?
One.
What is the body with the strongest gravitational pull in our solar system?
The Sun.
How strong is the Suns gravitational pull?
28 G.
When did a bright new star appear to the Chaoan people? And what was the new star? What did it leave behind? How strong is the gravitational pull at the surface of it?
July 4, 1045 AD. A supernova. A nebula (expanding cloud of gas and dust) with the remnants of the star in the middle of it (neutron star). 100,000,000,000G of gravitational pull.
How much empty space is there in atoms?
99.999%
What would happen in you dropped a pebble made of neutron star-stuff on the ground of Earth?
It would slice through the Earth.
Which theory, published in 1915 by Albert Einstein, explains how gravity actually works?
General relativity.
What does matter do to space?
Bends it.
In simple terms, what is everything in the universe doing?
Bending the universe. Moving in a straight line in curved space.
How long does an S-star take to orbit the centre of the galaxy?
15 years.
How massive is the black hole at the centre of our galaxy?
4 million * the sun.
How massive does a star have to be to collapse into a black hole?
Over 20 times the size of our sun.
Can anything escape a black hole?
No
