Big Bang

1. How everything began
2. Happened 13.8  billion years ago
3. Happened in a blink of an eye

Stonehenge

1. Made in the prehistoric times
2. Regarded as a British cultural icon
3. Presumed to be constructed from 3,000 BC to 2,000 BC

Aristotle

1. Ancient Greek philosopher and scientist
2. Proved that the Earth is a sphere and believed it was in the center of the universe
3. Made contributions to logic, metaphysics, mathematics, physics, biology, botany, ethics, politics, agriculture, medicine, dance and theatre

Ptolemy

1. A Greek writer, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology
2. Resided and worked in Alexandria, a major city in Egypt founded by Alexander the Great that was part of the Roman Empire
3. Like Aristotle, he believed that Earth was in the center of the universe



Aristarchus

1. An ancient Greek astronomer and mathematician who presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it
2. The first person to state that Earth rotates on its axis and revolves around the Sun
3. Spent most of his life working at the University of Alexandria in Egypt

Eratosthenes

1. A Greek mathematician, geographer, poet, astronomer, and music theorist
2. The chief librarian at the Library of Alexandria
3. Most famous for making the first accurate measurement of the circumference of the Earth

Hipparchus

1. A Greek astronomer, geographer, and mathematician
2. Most famous for his incidental discovery of precession of the equinoxes
3. Considered the founder of trigonometry

Copernicus

1. A Renaissance mathematician and astronomer
2. Formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe
3. Born and died in Royal Prussia

Tycho Brahe

1. A Danish nobleman and astronomer
2. Known for his accurate and comprehensive astronomical and planetary observations
3. One of the individuals whose work helped overturn that belief in favor of a heliocentric model of the universe, with the Sun at the center

Galileo Galilei

1. An Italian polymath: astronomer, physicist, engineer, philosopher, and mathematician
2. Played a major role in the scientific revolution of the seventeenth century
3. Discovered the mountains on the moon, the spots on the sun, and four moons of Jupiter

Johannes Kepler

1. A German mathematician, astronomer, and astrologer
2. A key figure in the 17th century scientific revolution
3. Best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy

Giovanni Cassini

1. An Italian mathematician, astronomer, astrologer and engineer
2. Born in Perinaldo, near Imperia, at that time in the County of Nice, part of the Duchy of Savoy
3. Discovered four satellites of the planet Saturn and noted the division of the rings of Saturn; the Cassini Division was named after him