Get facts about the solstice. Learn when the summer and winter solstice happen, what the word "solstice" means, and how people celebrate the event.| Science Notes and Projects
Learn about the seven SI base units of measurement. Get their abbreviations and learn how they are defined.| Science Notes and Projects
Learn about the astronomical unit (au or AU) in astronomy. Get the definition, example distances, history, and worked problems.| Science Notes and Projects
Get the values for the speed of light in different units. Learn whether anything can go faster than the speed of light.| Science Notes and Projects
Learn about the solar system in astronomy. Get its definition, discover the planets in order, and get interesting facts.| Science Notes and Projects
Learn about parallax in science and everyday life, including the effect and parallax error. Explore the uses of the phenomenon.| Science Notes and Projects
Get the vacuum definition in science. See examples of a vacuum and learn ways to produce one in everyday life.| Science Notes and Projects