Ch 1 and 2 - St. Denis
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26 Terms
Astronomers estimate the Universe to be how old?
14 Billion Years
How far away from the Earth is the Moon?
380,000 km
About how many stars are there in the night sky?
About 3,000
The study of the structure and evolution of the entire Universe is called:
Cosmology
The study of the entire Universe beyond Earth's atmosphere is called:
Astronomy
What objects are not considered to be part of our solar system?
Anything not within the Sun's gravitational pull
What objects are thought to be the largest structures in the Universe?
Filaments
How many definite constellations are there in the night sky?
88
About how many light years across is our galaxy?
100,000
What unit is used to measure degrees north or south in the Celestial Sphere?
Declination
What unit is used to measure degrees east or west in the Celestial Sphere?
Right Ascension
How long does it take for the zero Right Ascension mark to move around the Celestial Sphere?
26,000 years
The Milankovitch hypothesis states that changes in all three aspects of Earth motion are responsible for long-term global climate changes (ice ages). What are the three aspects of Earth motion that impacts long-term climate change?
Earth's axial tilt, precession, and eccentric orbit
The motion of objects in the sky, due to the rotation of Earth on its axis, is called:
Diurnal Motion
What unit is a measurement of distance, not time?
Light year
What is measured at 9.46 Trillion km?
Light year
What is the farthest point of an object in its orbit path called?
Aphelion
What is the closest point of an object in its orbital path called?
Perihelion
What is measured at 300,000 km/sec?
Speed of light
What is measured at 150,000,000 km?
Astronomical Unit/A.U.
What is the average distance between the Earth and the Sun?
150,000,000 km
What is the period of time called from one Vernal Equinox to the next?
Tropical Year
The time it takes for the Earth to move around the Sun relative to the stars is called:
Sidereal year
The rotation of Earth's axis itself which makes one complete conical circle about every 26,000 years is called:
Precession
The period of time when the Sun appears overhead in the exact spot as the day before is called:
Solar day
The period of time it takes for Earth to make one true rotation on its axis (360o) in relation to the stars is called:
Sidereal day