Kepler's laws of planetary motion law" is what became the Second Law in the set of three; but Kepler did himself not privilege it in that way. Johannes Kepler published his first two laws about planetary motion in 1609, having found them by analyzing the astronomical observations of Tycho Brahe. Kepler's third law was published in 1619. Kepler had believed in the Copernican model of the solar system, which called for circular orbits, but he could not reconcile Brahe's highly precise observations with a circular fit to Mars' orbit—Mars coincidentally having the highest eccentricity of all planets except Mercury. His first law reflected this discovery.
Virtual Planetary Laboratory explore the distribution of habitable worlds in the universe. The VPL team studies the effects of galactic, stellar, and planetary environments on planetary habitability. Task D incorporates VPL researchers from diverse and interdisciplinary fields who use laboratory work combined with chemical and climate models to study the impact of life on its environment. In addition, the interactions between the biosphere, planet, and host star are explored to determine how they can influence detectable biosignatures. In the final task, the VPL scientists observe our Solar System and extrasolar planets. The goal of this task is to develop astronomical and remote-sensing retrieval