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How Many Planetary Systems Are There?

January 24, 2024 by Diane Mitchell

How Many Planetary Systems Are There? There are over 700 known multi-planetary systems confirmed or stars which host at least two planets. The Kepler-90 planetary system contains eight planets, such as our Solar System. Another numerous planetary system is the TRAPPIST-1, which hosts seven planets. How many planetary systems are there in the universe? A

How Did Civilization Decide The Seven Day Cycle?

January 24, 2024 by Maria Kunar

How Did Civilization Decide The Seven Day Cycle? The Babylonians, who lived in modern-day Iraq, were astute observers and interpreters of the heavens, and it is largely thanks to them that our weeks are seven days long. The reason they adopted the number seven was that they observed seven celestial bodies — the sun, the