Science

An exoplanet is a planet beyond our Solar System, orbiting another star. The search for Earth-like exoplanets is really a search for measurable “Earth-ish” clues—size, orbit, starlight, and sometimes atmosphere—without pretending we already know what the surface is like. [a] ⓘ A Clear Starting Point Most “Earth-like” headlines boil down to three things: small (likely rocky), temperate (not too hot or cold from starlight), and… Exoplanets: Searching for Earth-like Planets Beyond Our Solar System

Moon phases are the changing slice of the Moon’s sunlit half that we can see from Earth as the Moon orbits us. The Moon itself does not “change shape”; only our viewing angle changes. [g] The Core Idea, Without the Fluff The Sun always lights half of the Moon, all the time. As the Moon moves around Earth, we see different portions of that lit… The Moon Phases Explained: Why Does the Moon Change Shape?

A galaxy type is a way to sort galaxies by how they appear in images—mainly their overall shape and visible structure. In everyday terms, most well-known galaxies fall into three broad families: elliptical, spiral, and irregular[a]↗. A Clean Mental Model to Start With Galaxy “types” are about shape and visible layout, not about which galaxies are “better” or “older.” A spiral can be calm or… Types of Galaxies: Elliptical, Spiral, and Irregular

A star is a self-gravitating ball of hot gas (plasma) that shines because its core releases energy through nuclear fusion. The “life cycle of a star” is the story of how that balance begins inside a cold nebula, settles into a long stable phase, and—if the star is massive enough—ends with a supernova that reshapes its neighborhood.[a]↗ A Simple Way to Hold the Whole Story… The Life Cycle of a Star: From Nebula to Supernova