Astrophysics: Structure of the Universe Test

What is the primary force responsible for shaping the structure of the universe?

• Gravity
• Electromagnetism
• Strong nuclear force
• Weak nuclear force

Which of the following is NOT typically found orbiting within a solar system?

• Moons
• Planets
• Comets
• Galaxies

Approximately how many stars are estimated to be in the Andromeda galaxy?

• 1 million
• 1 billion
• 1 trillion
• 1 quadrillion

What unit is used to measure gravitational field strength?

• N/m²
• N/kg
• kg/m³
• m/s²

Which of the following best describes the relationship between orbital speed and orbital radius?

• As radius increases, speed increases
• As radius decreases, speed increases
• Orbital speed is constant regardless of radius
• There is no relationship between orbital speed and radius

What is the correct formula for calculating orbital speed?

• v = 2πr × T
• v = 2πr ÷ T
• v = πr² ÷ T
• v = 4πr³ ÷ 3T

Why do comets move faster when they are closer to the Sun?

• They gain mass
• Their gravitational attraction increases
• They become colder
• The Sun's magnetic field accelerates them

Which of the following is NOT mentioned as an example of an orbital relationship in the text?

• Moons orbiting planets
• Planets orbiting stars
• Stars orbiting black holes
• Artificial satellites orbiting Earth

What is the name of our home galaxy?

• Andromeda
• Milky Way
• Triangulum
• Centaurus A

According to the text, what happens to a comet's mass as it gets closer to the Sun?

• It increases
• It decreases
• It remains constant
• It fluctuates randomly