Structure of Universe PPT

Open Ended

How do you think advancements in space science, such as astronomy and astrophysics, have impacted our understanding of the universe?

Multiple Choice

Which of the following best describes the significance of studying astrophysics and cosmology?

• They help us understand the origin, evolution, and structure of the universe.

• They are only concerned with the study of planets in our solar system.

• They focus solely on the chemistry of stars.

• They are unrelated to the laws of physics.

Multiple Choice

Which of the following correctly represents the hierarchical structure from Earth to the Universe as shown in the diagram?

• Earth → Solar System → Milky Way Galaxy → Local Group → Local Supercluster → Universe

• Earth → Milky Way Galaxy → Solar System → Local Group → Local Supercluster → Universe

• Earth → Solar System → Local Group → Milky Way Galaxy → Local Supercluster → Universe

• Earth → Local Group → Solar System → Milky Way Galaxy → Local Supercluster → Universe

Open Ended

Explain the difference between the geocentric and heliocentric theories as described in the introduction.

Multiple Choice

Which of the following statements about the Doppler-red-shift and galaxy motion is correct?

• All distant galaxies are approaching the observer due to Doppler-blue-shift.

• All distant galaxies are receding from the observer due to Doppler-red-shift.

• Nearby galaxies are receding faster than distant galaxies.

• The Doppler effect only applies to sound, not light.

Fill in the Blanks

The recessional motion of galaxies indicates that the universe is

and has no definite centre.

Open Ended

Compare and contrast the possible models of the expanding universe shown in the diagram. What are the key differences between a decelerating, coasting, and accelerating universe?

Fill in the Blanks

According to Hubble's Law, the velocity of recession of galaxies is proportional to the

of the galaxy from the observer.

Multiple Choice

What does the slope of the straight line in the graph of velocity (V) against distance (x) represent according to Hubble's Law?

• The speed of light

• The age of the universe

• The Hubble constant

• The mass of a galaxy

Open Ended

Explain how the Hubble constant helps in estimating the limit of the observable universe.

Fill in the Blanks

The age of the Milky Way galaxy is estimated to be

billion years.

Multiple Select

Which of the following statements about the age of the universe, as estimated using the Hubble constant, are correct?

• It assumes galaxies move with constant speed.

• It is calculated using the formula t = 1/H.

• It is independent of the Hubble constant.

• It assumes the universe began expanding at a specific instant.

Multiple Choice

Who proposed the Big Bang Evolutionary Theory of the Universe in 1931?

• Albert Einstein

• Abbe Lamaitre

• George Gamow

• Edwin Hubble

Open Ended

Compare and contrast the Big Bang Theory and the Steady-State Theory of the universe based on their explanations of the origin and evolution of the universe.

Multiple Choice

According to the Big Bang Theory, after the temperature fell to about 5000 °K, what significant event occurred?

• Formation of neutral hydrogen

• Fusion of heavier elements

• Formation of primordial helium

• Creation of black holes

Multiple Choice

Which theory of the universe suggests that the universe oscillates between periods of expansion and contraction, and what evidence supports this idea?

• Big Bang Theory; presence of hydrogen and helium

• Oscillating Theory; Hubble Law and Einstein’s theory of relativity

• Steady-State Theory; cosmological principle

• Evolutionary Theory; primordial fire ball radiation

Fill in the Blanks

The cosmological principle in the Steady-State Theory states that the statistical distribution of matter is uniform in

and space.

Open Ended

Explain the main differences between the Big Bang Theory and the Steady-State Theory regarding the origin and evolution of the universe.

Multiple Select

Which of the following are key features of the Steady-State Theory of the Universe?

• Density of matter is constant over time

• Universe has no beginning or end

• Matter is created from nothing

• Universe oscillates within finite limit

Open Ended

Discuss how cosmological tests such as the measurement of the Hubble constant and the abundance of primordial helium help in evaluating different theories of the universe.

Open Ended

Explain how the measurement of the Hubble constant for more distant galaxies provides evidence against the steady state theory.

Multiple Choice

Which theory suggests that the Hubble constant remains unchanged over time?

• Steady state theory

• Evolutionary theory

• Big-bang theory

• Cosmic inflation theory

Multiple Choice

Which equations describe the relationship between the number of galaxies, their distance, and the intensity of radiation received from them?

• N = k1R^3 and I = k2R^-2

• N = k2R^2 and I = k1R^-3

• N = k1R^-2 and I = k2R^3

• N = k2R^3 and I = k1R^-2

Multiple Choice

Based on the observed and theoretical distributions of radio-galaxies, what conclusion can be drawn about the density of galaxies over time?

• Density decreases with time

• Density increases with time

• Density remains constant

• Density fluctuates randomly

Fill in the Blanks

The discovery of the cosmic microwave background radiation by Penzias and Wilson provided strong evidence for the

theory.

Open Ended

Compare the abundance of primordial helium in old stars versus young stars and discuss its significance for cosmological theories.

Fill in the Blanks

Astrophysics is a branch of space science that applies the laws of physics and

to explain the birth, life and death of stars, planets, galaxies, nebulae and other objects in the universe.

Open Ended

Reflecting on today's lesson about space science, which major branch do you find most interesting and why?