Spacw

Question 1

How much time does it take for the earth to spin on its axis

Answer 1

24 hours - 1 day

Question 2

How long does it take for the earth to orbit around the sun?

Answer 2

365 days - 1year

Question 3

How long does it take for the moon to orbit the earth?

Answer 3

Approximately 1 month

Question 4

What is the equation for average orbital speed?

Answer 4

V = 2nr/ T. Where T is orbital period

Question 5

What does the solar system contains?

Answer 5

Sun, 8 planets, moons, minor planets, asteroid belt, smaller bodies like comets

Question 6

What are the names and order of planets from the sun?

Answer 6

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

Question 7

What properties do the first four and last four planets have?

Answer 7

First four - rocky small
Last four - large gaseous

Question 8

How does strength of gravity change with distance?

Answer 8

Graviatwitonal field at the surface depends on it mass
Strength decreases as the distance from planet increases

Question 9

What is the speed of light?

Answer 9

3x10^8 m/s

Question 10

Why do the planets orbit the sun?

Answer 10

The sun contains most of the mass of the solar system

Question 11

In an elliptical orbit when does an object moved fastest?

Answer 11

An object moves fastest in an elliptical orbit when it is closer to the sun as it needs

Question 12

In what order are the moons phases?

Answer 12

New moon
Waxing crescent
First quarter moon
Waxing gibbous moon
Full moon
Waning gibbous moon
Last quarter moon
Waning gibbous crescent moon

Question 13

What is summer solstice

Answer 13

When the northern hemisphere have their longest day and the southern hemisphere their shortest

Question 14

What is equinox

Answer 14

The time in the year when day and night are approximately equal lentgh

Question 15

What is winter solstice

Answer 15

When the northern hemisphere have their shortest day and the southern hemisphere their longest

Question 16

What type of star is our sun and what does it consist of ?

Answer 16

Medium sized safe consisting of mainly hydrogen and helium

Question 17

What powers stars?

Answer 17

They are powered by nuclear reactions that release energy

Question 18

What is an asteroid?

Answer 18

Small rocky object that orbits the sun

Question 19

What is a comet?

Answer 19

Comets are made of ice and dust and orbit the sun elliptically

Question 20

What is a galaxy?

Answer 20

Galaxies are made of billions of stars

Question 21

What is the measure of astronomical distances?

Answer 21

A light year

Question 22

How long is a light year?

Answer 22

9.5 x 10^15m

Question 23

How is a star formed?

Answer 23

From interstellar clouds of gas and dust that contain hydrogen called a nebula

Question 24

What comes after a nebula or interstellar cloud and how is it formed?

Answer 24

A protostar is formed as a nebula collapses and increases in temperature due to its internal gravitational attraction

Question 25

What comes after a protostar and how is it made?

Answer 25

A protostar becomes a stable star when it’s inward gravitational force Balances with its outward force caused by thermal expansion

Question 26

What happens after a stable star and why?

Answer 26

Eventually it runs out of hydrogen. Helium fusion takes place in the core so it begins to expand into a red giant or red supergiant

Question 27

What happens after the red giant and why?

Answer 27

A planetary nebula caused by the ejection of a red giants outer layers This planetary nebula has a hot dense core called a white dwarf

Question 28

What happens after the red supergiant and why?

Answer 28

Eventually they explode into a supernova which forms a nebula that contains hydrogen and heavier elements. Also it produces wither a neutron star or black hole

Question 29

What is the Milky Way and how big is it?

Answer 29

One of many billions of galaxies that make up the universe. 100000light years wide

Question 30

What is redshift?

Answer 30

Redshift is the increase in the observed wavelength of electromagnetic radiation emitted from receding stars and galaxies

Question 31

What does redshift show?

Answer 31

That the universe is expanding and gives evidence for the Big Bang

Question 32

What is the name of the microwave radiation at all points in space?

Answer 32

Cosmic microwave background radiation or (CMBR)

Question 33

What is the equation that comes with bubbles constant?

Answer 33

Ho = v/d

Question 34

What is hubbles constant?

Answer 34

2.2 x 10^-18 per second

Question 35

What is hubbles constant in words?

Answer 35

The ratio of the speed at which the galaxy is moving away from the earth to its distance from the earth

Question 36

What is the equation for the age of the universe?

Answer 36

d/v = 1/Ho