In 2016, NASA took on a new responsibility: defending our planet from devastating impacts by asteroids and comets that approach the Earth, or near-Earth objects. That event, which followed the prominent Chelyabinsk meteor explosion in 2013, reflected a growing interest in, and concern about, the threat of celestial impacts. In ancient times, the solar system’s small bodies—asteroids and com…
Featuring a wealth of never-before-published NASA photographs, charts, stories, and contributions by NASA astronauts and experts, A Visual Encyclopedia is a comprehensive exploration of space from our nearest planets and stars to far-off galaxies. Supports the Common Core State Standards.
This e-book contains about Mars's facts and geology.