The Double Cluster in Perseus consists of two open star clusters near each other on the sky’s dome. Amateur astronomers know them as h Persei and chi Persei. The two clusters reside in the northern ...

An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally bound to each other. In contrast, globular clusters ...

How do you pronounce words that begin with lots of consonants? What is a consonant cluster? It's a word that has multiple consonant sounds together. Look at the consonants at the starts of these words ...