🚌 W1 L1 & L2 - introduction and brief tour of the Cosmos

Question 1

Name one other galaxy in the Local Group

Answer 1

Andromeda

Question 2

Roughly how many galaxies in the Laniakea Supercluster?

Answer 2

About 100,000

Question 3

What travels faster than the speed of light?

Answer 3

The expansion of the Universe

Question 4

What is the speed of light in metres per second using scientific notation?

Answer 4

3 x 10⁸ m/s

Question 5

How long does light take to travel to Earth from the Sun?

Answer 5

8 minutes

Question 6

How long does light take to travel from the Orion Nebula to Earth?

Answer 6

1,344 years

the distance to the Orion Nebula is about 1,344 light years

Question 7

How long after the Big Bang did the cosmic microwave background originate?

Answer 7

380,000 years after the Big Bang

Question 8

How much of the Cosmos is luminous matter?

Answer 8

About 5%

Question 9

How much of the Cosmos is non-luminous “dark matter”?

Answer 9

About 30%

Question 10

How much of the Cosmos is dark energy?

Answer 10

About 65%

Question 11

How far away is the moon when measured in Earth diameters?

Answer 11

About 30 Earth diameters away

Question 12

How far is a parsec?

Answer 12

3.26 light years

Question 13

Roughly how many stars in our galaxy in scientific notation?

Answer 13

Roughly 10¹¹

Question 14

Rougly how many galaxies in the visible Universe?

Answer 14

Roughly 10¹¹

Question 15

Roughly how many stars in the visible Universe?

Answer 15

Roughly 10²²