Image from BBC.Co.UK
Bulan adalah satelit bumi, dan merupakan satelit terbesar ke lima di tata surya. Bulan tidak mempunyai sumber cahaya sendiri dan cahaya bulan yang biasa kita lihat pada malam hari, merupakan cahaya pantulan yang berasal dari matahari.
Bulan beredar mengelilingi bumi sekali setiap 27,3 hari, yang merupakan periode orbitnya, dan variasi periodik - periode sinodik - dari fase-fase bulan berulang setiap 29,5 hari.
Massa jenis bulan 3,4 g/cm³, lebih ringan dibanding massa jenis Bumi 5,5 g/cm³, sedangkan massa bulan hanya 0,012 massa Bumi.
The moon is the easiest celestial object to find in the night sky — when it's there. Moon phases and the moon's orbit are a mystery to many. Because it takes 27.3 days both to rotate on its axis and to orbit Earth, the moon always shows us the same face. We see the moon because of reflected sunlight. How much of it we see depends on its position in relation to Earth and the Sun.
Though a satellite of Earth, the moon is bigger than Pluto. Some scientists think of it as a planet (four other moons in our solar system are even bigger), though that viewpoint has never caught on officially. There are various theories about how the moon was created, but recent evidence indicates it formed when a huge collision tore a chunk of Earth away.
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