P1.3 - The Universe

Question 1

What is a collection of stars called?

Answer 1

A galaxy

Question 2

Put these objects in order of size (smallest to biggest) : Sun, Earth, Moon, Solar System, Galaxy

Answer 2

Moon, Earth, Sun, Galaxy, Solar System

Question 3

Name one other type of electromagnetic radiation that scientists use to observe objects in space

Answer 3

Gamma

Question 4

Explain why some telescopes are placed above the earth’s atmosphere

Answer 4

They are placed above cloud’s or the earth’s atmosphere because the atmosphere absorbs em waves

Question 5

What is SETI?

Answer 5

The Search for Extra Terrestrial Intelligence

Question 6

Explain how Space Probes, Surface Lander’s and Surface rover’s differ and what they are each used for

Answer 6

Space probe, known as an orbiter, goes into orbit around a planet where it can then take photos from above. A surface rover has wheels and lands on a planet which it

Question 7

What is the life cycle of Massive Stars?

Answer 7

Nebula, Protostar, Main Sequence, Red Supergiant, Supernova, Neutron Star, Black Hole

Question 8

What is the life cycle of average stars?

Answer 8

Nebula, Protostar, Main Sequence, Red Giant, Shell of Gas, White Dwarf

Question 9

How do the two stars differ?

Answer 9

Bigger stars have shorter lifespan. Fusion happens more rapidly and they both end up with different things.

Question 10

Why does CMBR support the theory the universe started as a tiny point of energy then expanded rapidly?

Answer 10

Because CMBR is Cosmic Microwave Background Radiation which is left over energy from the Big Bang

Question 11

What is Red Shift?

Answer 11

Where an object moves away from us, the wave length increases but the frequency of the wave decreases. The light appaears red because red has a long wave length.

Question 12

What is the steady state theory?

Answer 12

That the universe is still expanding and it always existed. At this point in time matter is being created

Question 13

What is the Big Bang theory?

Answer 13

Started 13.5 billion years ago, all matters started out as a tiny point of energy then the universe expanded from this point

Question 14

What was the theories of the Geocentric model? (2)

Answer 14

The Earth was at the central of the Solar System

Everything orbits Earth

Question 15

What were the two theories of the Heliocentric model? (2)

Answer 15

The sun is at the centre of the Universe

The planets orbit the sun

Question 16

What were the observations?

Answer 16

Sun moved across the sky

Moon, Stars, Planets move across the sky

Question 17

Put the planets in order (Mercury, Venus, Mars, Uranus, Neptune, Saturn, Jupiter)

Answer 17

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune