ดวงจันทร์อยู่ในระบบสุริยะหรือไม่

ดวงจันทร์ (Moon) จัดอยู่ในกลุ่มดาวบริวาร ซึ่งหมายถึงดาวเคราะห์ที่โคจรรอบดาวแม่ ดวงจันทร์เป็นสมาชิกประเภทหนึ่งของระบบสุริยะ มีลักษณะเป็นดาวเคราะห์ประเภทหนึ่งเพราะไม่มีแสงในตัวเอง ไม่ได้รับการจัดลำดับให้อยู่ในชั้นของดาวเคราะห์หลักเหมือนอย่างดาวพุธ ดาวศุกร์ โลก และดาวเคราะห์อื่นๆจำนวน 8 ดวงของระบบสุริยะ
สาเหตุที่ไม่จัดดวงจันทร์เป็นดาวเคราะห์เนื่องจากดวงจันทร์โคจรรอบดาว เคราะห์แม่ของตนเอง ไม่ได้โคจรรอบดวงอาทิตย์โดยตรง ในขณะดาวเคราะห์เหล่านั้นโคจรรอบดวงอาทิตย์

ดวงจันทร์ของโลกเรานั้นเป็นดาวบริวารหนึ่งเดียวของโลก โคจรรอบโลกโดยใช้เวลา 28 วันโดยประมาณ มีเส้นผ่านศูนย์กลาง 3,474 กิโลเมตร และอยู่ห่างจากโลก 384,403 กิโลเมตร มีมวลประมาณ 2% ของมวลของโลกและแรงโน้มถ่วงเป็น 17% ของโลก นั่นหมายความว่าดวงจันทร์มีแรงดึงดูดน้อยกว่าโลก 6 เท่า ถ้าเรากระโดดบนโลกได้สูง 1 เมตร เมื่อไปกระโดดบนดวงจันทร์จะกระโดดได้สูง 6 เมตร
ดวงจันทร์นั้นโคจรอยู่รอบโลกได้ก็เนื่องมาจากแรงดึงดูดของโลกนั้นเอง ทำให้ดวงจันทร์ไม่เคลื่อนที่ออกห่างไปไหน และอิทธิพลของแรงดึงดูดนี้เองทำให้เกิดน้ำขึ้น-น้ำลงบนโลกของเรา

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