Courses from 1000+ universities
$7.2 billion in combined revenue since 2020. $8 billion in lost market value. This merger marks the end of an era in online education.
600 Free Google Certifications
Machine Learning
Python
Microsoft Excel
Intelligenza Artificiale
Python for Data Science
Introduction to Philosophy
Organize and share your learning with Class Central Lists.
View our Lists Showcase
Explore NASA engineer Elaine Stewart's work on the James Webb Space Telescope and learn about the upcoming Roman Space Telescope launch in 2027.
Learn to process astrophotography images using SIRIL software, enhancing celestial captures with advanced techniques and tools for stunning results.
Explore the OSIRIS-REx mission to asteroid Bennu, its significance for planetary defense, and the latest 2024 updates in this engaging presentation.
Explore scientific perspectives on non-human intelligences and UAPs with Dr. Szydagis, examining evidence and hypotheses in this thought-provoking presentation.
Explore the role of small galaxies in the cosmic metal cycle, examining their metal content and evolution over billions of years using deep space observations from Hubble and ground-based telescopes.
Explore the interstellar medium and galaxy evolution with Dr. Hannah Bish, delving into gas dynamics, star formation, and galactic processes.
Explore upcoming solar eclipses, their physics, types, and safe viewing methods. Learn about 2023-2024 events across North America and get photography tips.
Explore exoplanets and the quest for extraterrestrial life with Dr. Schwieterman, delving into cutting-edge astrobiology research and cosmic discoveries.
Explore the intersection of science and science fiction with Dr. Rhett Allain, examining fictional scientific concepts in popular media and their real-world implications.
Explore astrophotography mosaics with Charles Bracken, covering planning, processing, and examples from 4 to 150+ panels. Learn techniques for capturing stunning wide-field celestial images.
Explore PixInsight's astrophotography workflow, from cosmetic corrections to star extermination, enhancing your celestial imaging skills.
Discover how to capture stellar spectra without expensive equipment, complex software, or advanced math skills through hands-on amateur astronomical spectroscopy techniques.
Discover how exoplanet demographics research reveals new insights into planetary system formation through analysis of sizes, orbits, and compositions with astrophysicist Dr. Tyler.
Discover the dramatic 1994 collision of Comet Shoemaker-Levy 9 with Jupiter, exploring this historic astronomical event and its visible impact on the planet's clouds.
Discover NASA's Planetary Defense Coordination Office and Near-Earth Object Observations Program with Dr. Kelly Fast, exploring asteroid impact hazards and response strategies.
Get personalized course recommendations, track subjects and courses with reminders, and more.