Question

1. which of the following statements is not true?

a. dust and gas form nebulae.
b. there are several types of galaxies.
c. the light from stars shows us what the star will look like in the future.
d. distance in space is measured in light - years.

Explanation:

• Option A: Nebulae are indeed formed from dust and gas in space, so this is true.
• Option B: There are several types of galaxies (e.g., spiral, elliptical, irregular), so this is true.
• Option C: The light from a star takes time to reach us (e.g., light from the Sun takes about 8 minutes). So the light we see from a star is what the star looked like in the past, not what it will look like in the future. This statement is false.
• Option D: Light - year is a common unit to measure distance in space (the distance light travels in one year), so this is true.

Answer:

C. The light from stars shows us what the star will look like in the future.