BZ #14 The Known Universe

What is the distance to the Sun's nearest star?

• 3.5 Ly

• 5.0 Ly

• 4.3 Ly

• 6.2 Ly

What is the approximate diameter of the Milky Way galaxy?

• 50,000 Ly

• 100,000 Ly

• 150,000 Ly

• 200,000 Ly

What is the distance to the center of the Milky Way galaxy when the sun is scaled down to 1 cm in diameter?

• 1.63 cm

• 2.5 m

• 1.7 million km

• 9.3 km

Why does the galaxy UDFy38135539 appear 13.1 billion light years away but is actually about 30 billion light years away?

• Due to the expansion of the universe

• Because of gravitational lensing

• Because of the speed of light

• Due to the Doppler effect

What are the three components that make up the universe?

• Stars, planets, and galaxies

• Dark matter, dark energy, and normal matter

• Light, energy, and matter

• Atoms, molecules, and particles

What percentage of the universe comprises normal visible matter?

• ~5%

• ~25%

• ~50%

• ~75%

How do we know dark matter and dark energy exist, when they cannot be observed directly?

• Through direct observation

• By their gravitational effects

• By their color

• Through sound waves

What is the shape of the universe if the internal angles of a triangle add up to less than 180°?

• Positively curved

• Flat

• Negatively curved

• Spherical

What is the shape of the universe if the internal angles of a triangle add up to more than 180°?

• Positively curved

• Flat

• Negatively curved

• Spherical

What is the fate of the universe if it is negatively curved?

• It will collapse

• It will expand forever at an increasing rate

• It will remain static

• It will shrink