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ESC1011 > Prac One > Flashcards

Prac One Flashcards

1
Q

When did the universe begin?

A

13.4 billion years ago.

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2
Q

How many galaxies are there in the universe?

A

100,000,000 (100 million).

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3
Q

What is the vomit comet?

A

A plane designed to fall toward the Earth, making it passengers weightless for a few minutes.

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4
Q

Who was the first scientist to think about gravity?

A

Issak Newton.

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5
Q

What is the relationship between the force of gravity and the size of the object.

A

The bigger the object, the greater the gravitational pull.

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6
Q

How many faces of the moon do we see?

A

One

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7
Q

How large it the tidal bulge of the moon’s rock?

A

7 meters.

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8
Q

What is the name of our galaxy?

A

The Milky Way.

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9
Q

What type of telescope is the Very Large Array in New Mexico?

A

Radio telescope.

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10
Q

Which galaxy will out galaxy collide with in 3-4 billion years?

A

Andrometer.

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11
Q

How strong is the force of gravity on Jupiter?

A

2.5 G.

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12
Q

What G number are we adapted to?

A

One.

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13
Q

What is the body with the strongest gravitational pull in our solar system?

A

The Sun.

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14
Q

How strong is the Suns gravitational pull?

A

28 G.

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15
Q

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?

A

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.

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16
Q

How much empty space is there in atoms?

A

99.999%

17
Q

What would happen in you dropped a pebble made of neutron star-stuff on the ground of Earth?

A

It would slice through the Earth.

18
Q

Which theory, published in 1915 by Albert Einstein, explains how gravity actually works?

A

General relativity.

19
Q

What does matter do to space?

A

Bends it.

20
Q

In simple terms, what is everything in the universe doing?

A

Bending the universe. Moving in a straight line in curved space.

21
Q

How long does an S-star take to orbit the centre of the galaxy?

A

15 years.

22
Q

How massive is the black hole at the centre of our galaxy?

A

4 million * the sun.

23
Q

How massive does a star have to be to collapse into a black hole?

A

Over 20 times the size of our sun.

24
Q

Can anything escape a black hole?

A

No

25
Q

What would happen if you fell feet first into a back hole?

A

Your feet would accelerate faster than your head, and you would stretch.

ESC1011 (32 decks)

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