Astronomy

a region beyond Neptune in the solar system containing icy objects like dwarf planets, asteroids, and comets

Pluto was once considered the ninth planet before its reclassification as a dwarf planet within the Kuiper Belt.

a highly energetic celestial object emitting powerful radiation from the center of a galaxy, often associated with a supermassive black hole

Astronomers observed a distant quasar, providing insights into the early universe.

a distant, hypothetical region surrounding the solar system, thought to harbor icy bodies and comets

The Oort Cloud is a theorized reservoir of comets and icy bodies that extends far beyond the solar system.

the outer layer of the Sun's atmosphere, observable as a plasma halo during a solar eclipse

During a total solar eclipse, the corona of the Sun becomes visible as a radiant halo around the moon.

the apparent path that the Sun traces in the sky over the course of a year, which is also the plane of the Earth's orbit around the Sun

The ecliptic is the path along which the Sun appears to move through the sky over the course of a year.

the apparent displacement or difference in the apparent position of an object when viewed along two different lines of sight, often used in astronomy to measure the distance of nearby stars

Astronomers use stellar parallax to measure the distances to nearby stars by observing their apparent shift against more distant background stars.

a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles

Pulsars were first discovered in 1967 by astronomers Jocelyn Bell Burnell and Antony Hewish.

a unit of measurement equal to the average distance between the Earth and the Sun, approximately 149.6 million kilometers

An astronomical unit measures distances within our solar system.

a unit of astronomical distance equivalent to about 3.26 light-years

Astronomers use parsec to measure distances to stars and galaxies.

a high-energy particle, mainly originating from outside the Solar System, that travels through space at nearly the speed of light

Cosmic rays play a role in shaping the Earth's atmosphere and climate.

(cosmology) the faint glow of radiation spreading through the universe, believed to be residual radiation from the Big Bang

The cosmic microwave background is remarkably uniform across the sky.

(cosmology) a theory proposing that the solar system formed from a rotating nebula of gas and dust about 4.6 billion years ago

The nebular hypothesis suggests how our solar system formed.

(cosmology) a measure of the rate at which the universe is expanding, determined from the observation of distant galaxies' recession velocities

The Hubble constant tells us how quickly the universe is expanding.

the matter and radiation that exists in the space between stars within a galaxy

The interstellar medium is made up of gas, dust, and cosmic rays.

the space surrounding the Sun dominated by solar wind

Solar wind particles create the heliosphere's boundary.

very small particles originally derived from stars, serving as raw material for forming planets, and existing between galaxies, stars, and other celestial bodies

Cosmic dust consists of tiny particles of matter floating in space, primarily composed of elements such as carbon, silicon, and iron.

a small celestial body that becomes visible as a meteor upon entrance into the atmosphere of the earth

A meteoroid is a small rocky or metallic object in outer space that is significantly smaller than an asteroid and larger than a micrometeoroid.

the ongoing increase in the general price level of goods and services in an economy over a period of time

High inflation reduces the purchasing power of consumers.

a disruption in earth's magnetic field caused by solar activity, resulting in variations that can impact electronic systems and communications on earth

A magnetic storm, also known as a geomagnetic storm, is a disturbance in Earth's magnetosphere caused by solar wind interactions.

the colored lights, mainly green and red, in the sky seen primarily near the southern magnetic pole

The aurora australis, also known as the Southern Lights, is a natural light display that occurs in the high-latitude regions of the Southern Hemisphere.

the colored lights, mainly green and red, in the sky seen primarily near the northern magnetic pole

The aurora borealis, also known as the Northern Lights, is a natural light display that occurs in the high-latitude regions of the Northern Hemisphere.

associated with the phenomena, processes, or theories related to the origin and formation of the universe or celestial bodies

Cosmogonic theories explore how the universe began and evolved.

study of celestial objects outside the Milky Way galaxy

Extragalactic astronomy explores objects beyond our Milky Way.

relating to or resembling a nebula, which is a cloud of gas and dust in outer space

Nebular theory posits that stars and planetary systems form from the gravitational collapse of nebulae.

relating to a system of time measurement based on the positions and movements of the stars

The satellite’s positioning was adjusted based on sidereal time to maintain its orbit.