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Stack #4669300
| Question | Answer |
|---|---|
| solar system | the sun and all of the planets and other bodies that travel around i |
| heliocentric | sun-centered |
| geocentric | describes something that uses Earth as the reference point |
| parallax | an apparent shift in the position of an object when viewed from different locations |
| gravity | a fundamental force of attraction that acts between all objects with mass or energy in the universe. |
| orbit | the gravitationally curved, repeating path of an object—such as a star, planet, moon, or spacecraft—around a point in space. |
| aphelion | the point in a celestial body's elliptical orbit (planet, comet, or satellite) where it is farthest from the Sun. |
| perihelion | the point in an orbit around the Sun where a celestial body (planet, comet, or satellite) is closest to the Sun. |
| centripetal force | The direction of the centripetal force is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path. |
| solar nebula | a rotating, flattened disk of gas and dust that existed roughly 4.6 billion years ago, from which our Sun and planets condensed. |
| planetesimal | small, solid celestial bodies—ranging from meters to hundreds of kilometers in size—formed from dust, rock, and ice during the early stages of solar system development. |
| nuclear fusion | a scientific process where two light atomic nuclei combine to form a single, heavier nucleus, releasing massive amounts of energy. |
| sunspot | temporary, dark, planet-sized regions on the Sun's surface (photosphere) caused by intense magnetic field concentrations that inhibit heat convection. |
| solar flare | large eruptions of electromagnetic radiation from the Sun lasting from minutes to hours. |
| prominence | a large, bright, plasma-filled feature extending outward from the Sun's surface |
| terrestrial planet | a planet composed primarily of silicate rocks, metals, and has a solid, compact surface, |
| astronomical unit | a unit of length used by astronomers to measure distances within our solar system, |
| gas giant | a large planet composed primarily of hydrogen and helium, featuring a thick atmosphere, no solid surface, and a small, dense core. |
| dwarf planet | a celestial body orbiting the Sun that is massive enough to be rounded by its own gravity (hydrostatic equilibrium) but has not cleared its orbital neighborhood of other debris. |
| Kuiper Belt | a vast, donut-shaped region of icy bodies, dwarf planets, and comets extending beyond Neptune's orbit |
| Kuiper Belt object | a small, icy body orbiting the Sun in a massive, doughnut-shaped disk beyond Neptune, roughly 30 to 50 astronomical units (AU) from the Sun. |
| comet | cosmic, icy, and dusty leftovers from the formation of the solar system 4.6 billion years ago. |
| Oort cloud | a theoretical, gigantic spherical shell surrounding the solar system, acting as a "bubble" composed of billions of icy, comet-like objects. |
| asteroid | small, rocky, airless remnants left over from the formation of our solar system 4.6 billion years ago. |
| meteoroid | a small, solid, rocky or metallic body traveling through interplanetary space, ranging in size from dust grains to small asteroids (roughly tens of meters across). |
| meteor | the streak of light—commonly called a "shooting star"—produced when a small solid particle from space (a meteoroid) enters Earth's atmosphere at high speed and burns up due to friction. |
| meteorite | a solid piece of debris from an extraterrestrial object—such as an asteroid, comet, or planet—that survives its passage through the atmosphere and lands on the surface of a planet or moon. |
Created by:
Laylani colon