Whenever possible we design an age study to take advantage of other ways of checking the reliability of the age measurements.Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.
The most prevalent meteorites found on Earth contain small, partly glassy spheres called chondrules, and such rocks are termed chondrites (of at least 14 different types).A poikilitic clast (PK1) clast has a texture with a few plagioclase crystals up to 0.2 mm in diameter set in a fine grayish poikilitic-like matrix. (2003) Feldspathic lunar meteorites and their implications for compositional remote sensing of the lunar surface and the composition of the lunar Warren P. Fine-grained (up to 30 microns) olivine and pyroxene are rarely found in the matrix. The relatively rare iron meteorites and also the pallasites presumably represent the disaggregated cores of former planetary bodies.Gravitational interactions among all bodies orbiting the Sun cause perturbations that result in collisions between some of them.(Contrary to scenes from the movie Star Wars, there now are very large distances between each of the asteroids, but they do get hit by other orbiting objects, or are gradually moved into transfer orbits from which they can be perturbed into Earth-crossing trajectories).