Unit E Section 3,1

Question 1

Who made one of the first telescopes?

Answer 1

In 1608, a Dutch optician named Hans Lippershey

but it is Galileo who has been credited with first using the telescope to study the visible features of the night sky.

Question 2

Why are optical telescopes known as “light collector”

Answer 2

series of lenses and mirrors gather and focus the light from stars so that we can see it

Question 3

The larger the area of the lenses or mirrors in a

telescope……..

Answer 3

the greater the ability of the telescope to see the faint light of objects that are very distant.

Question 4

What was the first telescope that was ever designed?

Answer 4

a simple refracting telescope.

Question 5

what are refracting telescopes?

Answer 5

Refracting telescopes use two lenses to gather and focus starlight

Question 6

What is the disadvantage of refracting telescopes?

Answer 6

There is a limit to how large a refracting telescope can be.

Any diameter over 1 m causes the glass in the lens to warp under its own weight

Question 7

In a refracting telescope…..

The lens on which we put our eyes is called:

Answer 7

eye piece lens

Question 8

In a refracting telescope…..

The lens on which we put our eyes is called:

Answer 8

eyepiece lens

Question 9

In a refracting telescope…….

The lens that is opposite of the eyepiece lens is:

Answer 9

primary light-gathering

lens

Question 10

What are Reflecting telescopes?

Answer 10

Reflecting telescopes use mirrors instead of lenses to gather and focus the light from stars

Question 11

How is the reflecting telescope built?

Answer 11

At one end of a reflecting telescope is a large concave
mirror, which is made from a glass-like material that is coated with a thin layer of metal. The metal, such as aluminum, is polished to a shiny finish so that it can reflect the faintest light it receives.

Question 12

What is spin casting?

Answer 12

a method to form the largest mirrors

Question 13

What does the process of “spin casting” require?

Answer 13

This process requires that molten glass be poured
into a large spinning mold.

the spinning mold forces the melted glass to the mold’s outside edge.

After the glass cools and solidifies, technicians grind it into the desired shape for the telescope

Question 14

What is the advantage of spin casting?

Answer 14

is quicker and less costly than previous methods of making mirrors

Question 15

Parts of A reflecting telescope?

Answer 15

primary light-gathering
mirror focus
eyepiece lens
secondary mirror

Question 16

interferometry

Answer 16

This technique of using telescopes in combination is known as interferometry.

Question 17

Why are telescopes sometimes combined?

Answer 17

When working together, they can detect objects in space with better clarity and at greater distances than any other current Earth-based observatories can

Question 18

Examples of interferometry

Answer 18

-Keck I and Keck II are located 85 m apart from each
other.

-Very Large Telescope of the European Southern Observatory, located high in the Andean Mountains in
Chile. It is really four separate telescopes being used together.

Question 19

What factors can interfere with star gazing?

Answer 19

Clouds, humidity (moisture in the air), and even high winds can interfere with star-gazing

Question 20

What type of telescope is the Hubble telescope?

Answer 20

a reflecting telescope

Question 21

What is the advantage of the Hubble telescope?

Answer 21

Clouds, humidity(moisture in the air), and even high winds do not affect the star gazing

Question 22

What does the Hubble Space Telescope?

Answer 22

Orbiting about 600 km above Earth, the Hubble Space Telescope (a reflecting telescope) uses a series of mirrors to focus light from extremely distant objects.

goes to activities such as turning the telescope to focus on a new object of interest or switching data transmission modes

Hubble Space Telescope have discovered galaxies in parts of space (located in outerspace)

Question 23

Each orbit that the Hubble makes around Earth takes about…….

Answer 23

95 min

Question 24

Parts of a Hubble Space Telescope:

Answer 24

imaging electronics

solar panels

primary light-gathering mirror

Sun shield