First Astonomy Quiz Flashcards
Accelerate
to change velocity; to speed up, slow down, or change direction.
apparent magnitude
a measure of how bright a star looks in the sky; the larger the number, the dimmer the star appears to us
astrology
the pseudoscience that deals with the supposed influences on human destiny of the configurations and locations in the sky of the Sun, Moon, and planets
celestial equator
a great circle on the celestial sphere 90° from the celestial poles; where the celestial sphere intersects the plane of Earth’s equator
celestial poles
points about which the celestial sphere appears to rotate; intersections of the celestial sphere with Earth’s polar axis
celestial sphere
the apparent sphere of the sky; a sphere of large radius centered on the observer; directions of objects in the sky can be denoted by their position on the celestial sphere
circumpolar zone
those portions of the celestial sphere near the celestial poles that are either always above or always below the horizon
cosmology
the study of the organization and evolution of the universe
ecliptic
the apparent annual path of the Sun on the celestial sphere
epicycle
the circular orbit of a body in the Ptolemaic system, the center of which revolves about another circle (the deferent)
geocentric
Ideology that the solar system orbited around the earth.
heliocentric
Ideology that the solar system orbited around the sun.
horizon (astronomical)
a great circle on the celestial sphere 90° from the zenith; more popularly, the circle around us where the dome of the sky meets Earth
Horoscope
a chart used by astrologers that shows the positions along the zodiac and in the sky of the Sun, Moon, and planets at some given instant and as seen from a particular place on Earth—usually corresponding to the time and place of a person’s birth
parallax
the apparent displacement of a nearby star that results from the motion of Earth around the Sun
planet
today, any of the larger objects revolving about the Sun or any similar objects that orbit other stars; in ancient times, any object that moved regularly among the fixed stars
precession (of Earth)
the slow, conical motion of Earth’s axis of rotation caused principally by the gravitational pull of the Moon and Sun on Earth’s equatorial bulge
retrograde motion
the apparent westward motion of a planet on the celestial sphere or with respect to the stars
year
the period of revolution of Earth around the Sun
zenith
the point on the celestial sphere opposite the direction of gravity; point directly above the observer
zodiac
a belt around the sky about 18° wide centered on the ecliptic
How the solar system came to be
- Big Bang occurs- solid matter is created and pieces collide and stick to form stars and the solar system.
- The sun forms- Massive dust clouds start to spin fast enough to accumulate gas which helped formed the sun.
- Inner Planets were formed- Mercury, Venus, Mars, and Earth.
- Outer Planters are formed- Jupiter, Saturn, Uranus, and Neptune.
- Earth collides with planet theia to make the moon.
- Earth begins to cool down- asteroids bombard the earth and dent it up, the collision causes the heat to die down. Causes water for form.
7.Landmasses on the earth begins to form due to volcanic erupts. - Life forms begins on earth due to chemicals evolving into bacteria and oxygen(atmosphere) being produced.
- Continents divided
- Ice age forms
Rotation
Movement in a circular path about a fixed point(axis)
IS either clockwise or counterclockwise.
Dust and debris from the earth’s formation gravitated towards its core in a pattern of an enertial circle.
Causes the apparent flattening of the earth.
Relativity
Because we are moving(with the earth) in a circular path, everything that appears to follow a straight line is actually curved while everything that is straight is actually a curved line.
Natural movement is always:
Circular
Layers of the atmosphere
Troposphere- the sky
Stratosphere- the ‘upper’ sky
Mesosphere- the ‘glow’ of the earth(to high for planes)
Thermosphere- orbit zone(where satellites orbit)
Exosphere- the beginnings of space,
Copernican Theory/model
A model made by a Greek philosopher who believed that the planets orbited around the sun.
Ptolemaic’s Theory/model
A made by a philosopher that believed that the planets orbited around the earth.
Location on earth is measured by:
Longitude and Lagitude
Location of the night sky is measured by:
Altitude and the Azamith
Super cluster(or cluster)
A collection of several galaxies, galaxy groups, and dark matter.
Asteroid
A broken off piece of rock from earth that has no gas atmosphere
Comet
A broken off piece of rock from earth that has a gas atmosphere, that when it crashes into earth, provides more oxygen.
Andromeda
The galaxy closest and next to the milky way galaxy and the easiest to see on earth.
Perihelion
When planets are the closest point to the sun.
Strange astronomical anomalies occur here.
Aphelion
When planets are the farther point away from the sun.
electricity
how far off a planet was pulled from it’s originally orbit.
Apogee
When the moon is at the farthest point away from the earth.