Question 1:
What does a galaxy mean?
Answer:
A galaxy is a set of bodies that are made up of millions of stars together with gas and dust.
What does a galaxy mean?
Answer:
A galaxy is a set of bodies that are made up of millions of stars together with gas and dust.
Question 2:
Describe the birth of a star.
Answer:
The birth of a star is believed to have happened through the Nebular
Hypothesis:
i. The nebula cloud that contains gas and dust begins to compress due to the gravity action on it.
ii. Stronger gravity causes the gas and dust to be compressed in the center and start to rotate.
iii. As time passes, this object becomes bigger, more compact and its gravity increases. Its rotation also becomes faster.
iv. The nebula begins to shrink and form a hot and high density core.
v. This hot core releases its heat and light as a result of the nuclear reaction, and then it forms a star.
Describe the birth of a star.
Answer:
The birth of a star is believed to have happened through the Nebular
Hypothesis:
i. The nebula cloud that contains gas and dust begins to compress due to the gravity action on it.
ii. Stronger gravity causes the gas and dust to be compressed in the center and start to rotate.
iii. As time passes, this object becomes bigger, more compact and its gravity increases. Its rotation also becomes faster.
iv. The nebula begins to shrink and form a hot and high density core.
v. This hot core releases its heat and light as a result of the nuclear reaction, and then it forms a star.
Question 3:
Predict the effects that will happen to the solar system when the Sun dies.
Answer:
(a) The Earth’s temperature will become very low because there is no heat from the Sun.
(b) There will be no day and night phenomenon because the Earth has no source of light.
(c) Living things on Earth will die due to extremely low temperature.
Predict the effects that will happen to the solar system when the Sun dies.
Answer:
(a) The Earth’s temperature will become very low because there is no heat from the Sun.
(b) There will be no day and night phenomenon because the Earth has no source of light.
(c) Living things on Earth will die due to extremely low temperature.
Question 4:
What are the characteristics to classify stars?
Answer:
Size, colour, temperature, brightness and distance from Earth.
What are the characteristics to classify stars?
Answer:
Size, colour, temperature, brightness and distance from Earth.
Question 5:
Based on observation on Earth, how can the temperature of a star be determined?
Answer:
The temperature of a star is determined through observation of the colour of the star as seen from Earth using a telescope.
Based on observation on Earth, how can the temperature of a star be determined?
Answer:
The temperature of a star is determined through observation of the colour of the star as seen from Earth using a telescope.