- The Sun is the nearest star to Earth and appears as a dot of light due to its vast distance; most stars are invisible without telescopes.
- Approximately 2,000–2,500 stars are visible to the naked eye, and no green stars are perceived by human vision.
- Stars with higher mass generally have shorter life spans, while lower-mass stars can last billions of years.
- The majority of observed stars are red dwarfs, which are small, cool, and long-lived.
- Stars are classified by spectral type (O, B, A, F, G, K, M) based on temperature, with O being hottest (>33,000 K) and M coolest (2,600–3,850 K).
- Sample stars for each class include Zeta Ophiuchi (O), Rigel (B), Altair (A), Procyon A (F), Sun (G), Epsilon Indi (K), and Proxima Centauri (M).
Parent Tip: Review the logic above to help your child master the concept of characteristics of stars worksheet answer key.
