Question

1. choose all that apply. which three traits are used to classify stars?

□ size
□ number of planets
□ age
□ color
□ magnitude
□ amount of hydrogen

Explanation:

To classify stars, we analyze each trait:

• Color: Stars have different colors (e.g., blue, red) related to temperature.
• Magnitude: Apparent/absolute magnitude measures brightness.
• Size: Stellar size (e.g., dwarf, giant) is a key classification trait.
• "Age" can be a factor but is less direct for basic classification. "Number of planets" and "amount of hydrogen" are not primary star - classification traits (planets orbit stars, hydrogen amount is more about stellar evolution stages but not a core classification trait like the first three).

Answer:

The three traits used to classify stars are:

• $\square$ color (checked)
• $\square$ magnitude (checked)
• $\square$ size (checked)