The radiative and particulate loss of mass by the Sun, -9.13*10^-14 Solar masses per year or more causes the orbits of the planets to expand at the same rate, and their periods to lengthen at twice this rate. Unfortunately, under the present definition of the Astronomical Unit (AU) based on the fixed Gaussian gravity constant kGS = 0.01720209895 (AU)^1.5/day, the value AUmet of the AU in meters must decrease at 1/3 this rate, all these rates being expressed logarithmically. The progress of th...| ADS
Get Oort Cloud facts. Learn about its location and size, the objects it may contain, and how scientists study it.| Science Notes and Projects
Get facts about the Kuiper belt, including what it is, how far out it extends, and what bodies (Kuiper belt objects or KBOs) it contains.| Science Notes and Projects
Kepler’s laws of planetary motion, explained with history, comparisons, equations, examples, implications, and modern applications.| Science Notes and Projects
The ladder method is an easy way of converting metric units using simple conversion factors. Here's how it works.| Science Notes and Projects
The volumes of group VI include topics such as astronomical instruments, position and time determination, astronomical constants, abundances of the elements in the universe, the solar system, the stars, special types of stars, star clusters and associations, the stellar system, and galaxies. Particular importance was attached to the requirement that the contents should be usable by non-astronomers as well.The last few decades have been called the "Golden Age of Astronomy." The rapid increase ...| Google Books
Explore Saturn facts with this detailed guide covering the planet's rings, moons, atmosphere, structure, missions, and viewing from Earth.| 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
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