Earth and the Universe- Lessons 1-2

What is the main characteristic of a spiral galaxy?

• Triangular shape
• Football shape
• Pinwheel arms
• Circular center

How are elliptical galaxies classified?

• Based on their color
• Based on their shape
• Based on their size
• Based on their brightness

What distinguishes an irregular galaxy?

• Chaotic appearance
• Perfect symmetry
• Circular structure
• Spiral arms

What type of stars are typically found in irregular galaxies?

• Young stars
• Ancient stars
• Red giants
• White dwarfs

Why do elliptical galaxies have a smooth appearance?

• Due to intense heat
• Lack of interstellar matter
• Presence of black holes
• Abundance of nebulae

What is the sun categorized as among stars?

• Largest star
• Red giant
• Yellow star
• White dwarf

Why does the sun appear larger than other stars from Earth?

• Due to its brightness
• Because it emits more heat
• Closer proximity to Earth
• Larger size

In what unit is distance often measured in outer space?

• Centimeters
• Light-years
• Meters
• Kilometers

How far is Proxima Centauri from Earth in light-years?

• 1.7 light-years
• 3.5 light-years
• 4.2 light-years
• 5.9 light-years

What is the distance between the sun and Earth in miles?

• 50 million miles
• 75 million miles
• 100 million miles
• 93 million miles