Telescopes
Celestron StarSense Explorer DX 130AZ
A Newtonian reflector telescope that naturally connects to Newton's work on light, gravity, and motion.
View resourceBefore satellites could be tracked, before rockets could reach orbit, and before GPS could guide people across Earth, Isaac Newton helped explain the gravity and motion shaping it all.
Lived
1643–1727
Known for
Gravity and laws of motion
Field
Mathematics and natural philosophy
TransitSatellite connection
Gravity and orbital motion
Early life
Isaac Newton was born in Woolsthorpe, England, in 1643. His father died before he was born, and his early life included family difficulty and periods of isolation and study.
Newton later studied at Cambridge, where mathematics, natural philosophy, and astronomy became central to his work.
The story
Newton wanted to understand why objects fall, why planets move, and why the Moon stays in motion around Earth.
His laws of motion and theory of universal gravitation helped connect motion on Earth with motion in the heavens, showing that the same physical principles could help explain both.
Earth and Moon
Gravity pulls objects toward Earth, but the Moon does not simply fall straight down because it also has sideways motion.
The Moon continually falls toward Earth while moving forward, producing an orbital path. Artificial satellites follow the same broad principle.
The Earth and Moon pages in TransitSatellite provide a direct way to connect Newton's ideas with objects users can explore.
Orbit explained
A satellite in orbit is not beyond gravity. Gravity is continually pulling the spacecraft toward Earth.
The satellite also has horizontal velocity. It falls toward Earth while moving forward quickly enough that Earth's curved surface continues falling away beneath it.
TransitSatellite's orbital paths are modern visualizations of this relationship between motion, gravity, speed, and position.
These curated skywatching and learning resources connect to the themes in this story. Affiliate links may earn TransitSatellite a commission at no extra cost to you.
Telescopes
A Newtonian reflector telescope that naturally connects to Newton's work on light, gravity, and motion.
View resourceTelescopes
A more advanced computerized telescope for observers ready to go deeper into orbital motion and night-sky objects.
View resourceContinue exploring
Sources
Last reviewed 31 August 2026. TransitSatellite presents historical and scientific stories for educational use. Historical people are discussed as part of the learning record and do not endorse TransitSatellite.