Courses from 1000+ universities
Buried in Coursera’s 300-page prospectus: two failed merger attempts, competing bidders, a rogue shareholder, and a combined market cap that shrank from $3.8 billion to $1.7 billion.
600 Free Google Certifications
Psychology
Information Technology
Digital Marketing
AP® Microeconomics
Let's Get Started: Building Self-Awareness
Dino 101: Dinosaur Paleobiology
Organize and share your learning with Class Central Lists.
View our Lists Showcase
Explore celestial sphere basics, horizon diagrams, and astronomical positioning concepts using simulations and NASA imagery for a comprehensive introduction to observational astronomy.
Explore the Hertzsprung-Russell Diagram, a fundamental tool for analyzing stellar properties, and learn about spectral classes and white dwarfs in astronomy.
Explore stellar brightness, comparing apparent and absolute magnitudes to understand the true luminosity of stars despite their varying distances from Earth.
Explore the interplay of luminosity, temperature, and surface area in astronomy, understanding key concepts like the Stefan-Boltzmann Law and HR Diagram.
Explore Newton's 1st and 2nd laws of motion, covering constant velocity, forces, and free-body diagrams. Gain foundational knowledge for understanding celestial mechanics in astronomy.
Explore the fascinating process of star formation and discover how long stars live in their main hydrogen-fusing phase in this concise astronomy lecture.
Explore Earth's seasonal changes through an in-depth examination of astronomical factors, utilizing interactive simulations and expert insights to enhance understanding of this natural phenomenon.
Explore the Sun's changing path across the daytime sky throughout the year, enhancing your understanding of celestial movements and seasonal variations.
Explore celestial movements across Earth's latitudes using Stellarium, a free sky simulator, to understand how star motions appear differently from various global positions.
Master fundamental physics concepts through step-by-step problem-solving techniques covering free body diagrams, free fall, projectile motion, and multi-object systems.
Get personalized course recommendations, track subjects and courses with reminders, and more.