Which statement about celestial systems is correct is________
A. Extragalactic galaxies and the Milky Way belong to different levels of celestial systems
B. A celestial body system is formed by mutual attraction and revolving between celestial bodies
C. The Milky Way is a celestial system centered on the sun
D. Divided by affiliation, the Earth-Moon system is part of the galaxy
Answer:B
Which statement about celestial systems is correct is________
A. Extragalactic galaxies and the Milky Way belong to different levels of celestial systems B. A celestial body system is formed by mutual attraction and revolving between celestial bodies C. The Milky Way is a celestial system centered on the sun D. Divided by affiliation, the Earth-Moon system is part of the galaxy