The Big Dipper is one of the most well-known asterisms. Asterisms may or may not be part of a constellation. Asterism A pattern of stars recognizable to observers from Earth. Apparent Retrograde Motion Apparent retrograde motion is where a superior planet appears to change direction in the sky for a short time as it is overtaken by Earth in its orbit around the Sun. Aphelion Aphelion is the point farthest away from the Sun on Earth's elliptical orbit. It is involved in annular solar eclipses and planet transits. Antumbra The antumbra is the lighter part of a shadow that forms at a certain distance from the object casting the shadow. Annular Solar Eclipse An annular solar eclipse happens when the Moon covers the Sun's center, leaving the Sun's visible outer edges to form a “ring of fire” or annulus around the Moon. Altitude (elevation) Altitude or elevation is the vertical angle an object makes with the horizon. The Moon has an Albedo of 0.12, while Earth's average albedo is 0.3. 1 on the scale refers to a perfectly reflective object. Albedo is measured on a scale from 0 to 1, where 0 refers to an object that is completely dark, i.e., it does not reflect any light. Derived from Latin, albedo means "whiteness" ( albus= "white"). Top Albedo In astronomy, the term albedo refers to the brightness of an object in space. Business Date to Date (exclude holidays).EXOGEOLOGY – How geology relates to celestial bodies like moons, asteroids, meteorites, and comets.SELENOGRAPHY – How physical features on the moon formed such as lunar maria, craters, and mountain ranges.AREOLOGY – How geology is composed on Mars.ASTROGEOLOGY – How geology relates to celestial bodies like moons, asteroids, meteorites and comets.For example, it understands and catalogs features such as lunar maria, craters, and mountain ranges on the moon. Lastly, selenography studies the physical features of the moon. They both focus on how geology relates to celestial bodies like moons, asteroids, meteorites, and comets. READ MORE: 15 Facts About Mars: The Remarkable Red Planet Īstrogeology is very closely related to exogeology. Specifically, it was getting a close-up of the composition or areology of Mars. When the Mars Rover started wheeling around the red planet, its crosshairs were targeting the rocks and geology of Mars. ASTEROSEISMOLOGY – How to study the internal structure of stars by observing their oscillations.HELIOSEISMOLOGY – How the interior structure and dynamics of stars are composed by observing waves from their surface.HELIOPHYSICS – How the sun’s constant and dynamic radiation affects its surroundings in space.PHOTOMETRY – How luminous astronomical objects are in space based on electromagnetic radiation.SPECTROSCOPY – How light reflects, absorbs, and transfers between matter.COSMOLOGY – How the universe was created, evolves, and its ultimate fate.ASTROPHYSICS – How the laws of physics apply to stars and celestial bodies.There have been various heliophysics missions to study space weather, solar flares, and the constant stream of solar particles from the sun. But helioseismology is specific to our sun.įinally, heliophysics studies the sun’s constant and dynamic radiation that affects its surroundings in space. They both study the internal structure of stars by measuring radiation and oscillations. In a similar manner, photometry examines how luminous astronomical objects are in space based on electromagnetic radiation properties.Īsteroseismology is closely related to helioseismology. Spectroscopy studies how light reflects, absorbs, and transfers between matter. For example, cosmologists study red-shift to see how fast the universe is expanding. Akin to geophysics which studies Earth’s physics, astrophysics relates physical processes and properties to stars, celestial bodies, and its surrounding space.Ĭosmology is different from astrophysics because it studies the evolution and expansion of the universe. Astrophysics applies the principles of physics to astronomy.
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