Have you ever looked for pictures in the stars at night? Like the sky is a giant dot-to-dot puzzle? We call groups of stars which form a picture in our imagination, a constellation. Ancient cultures all over the world created their own constellations and told stories about them.
You might have seen parts of constellations in the sky at night. Maybe you've spotted the 3 bright stars which make a "belt" in the constellation, Orion. Or you've seen the part of the Great Bear which contains the "big dipper". Did you know we have a name for these smaller parts of constellations? We call them asterisms.
Astronomers use constellations as a map of the night sky. When they talk about a constellation they mean the area of the sky it is in - not just the stars in it. Astronomers divide the sky into 88 areas each containing a constellation. This means every point in the sky belongs to one of those 88 official constellations.
Different parts of the world have different views of the night sky. This means they see different patterns in the stars and have created different constellations. In the Northern Hemisphere, we still use the constellations people in Ancient Greece imagined and named. European explorers in the 15th century onwards named constellations in the Southern Hemisphere. Though indigenous people (the people who first lived there) had their own names for shapes in the stars.
You might already know 12 of the names of the 88 official constellations. Names like Leo, Aries, or Libra. We call these the signs of the zodiac. These constellations are in the area of the sky the Sun appears to travel through during each year. This is why people use them as a calendar. Many people believe these constellations to have special significance.