Will it affect our mood? A small asteroid will be orbiting Earth for the next two months, reigniting an age-old debate about whether the Moon has power over humans.
Earth to get a second moon on Sunday
Forceful: The Moon's gravitational pull generates a tidal force which causes Earth — and its water — to bulge out on the side closest to it and the side farthest away. These bulges of water are high tides. Glossary
Asteroid - A small body in space, made of metal and rock material. Asteroids usually orbit the sun, but if knocked off course they can be drawn into Earth’s gravity and fall towards it.
Pliny the Elder - Gaius Plinius Secundus (23 - 79AD), better known as Pliny the Elder, studied botany and philosophy in Ancient Rome and created the first known encyclopaedia.
Psychiatrist - A doctor who specialises in diagnosing and treating mental illnesses.
Bipolar disorder - A mental condition affecting mood, which can swing between extremes.