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AST 111 Exam 1 | Questions with Verified Answers
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AST 111 Exam 1 | Questions with Verified Answers
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AST 111 Exam 1 | Questions with VerifiedAnswers
Scientific Method - ✔✔The reasoning style by which scientist test theories against evidence
to understand how nature works.
Scientific Method steps - ✔✔1. Make observations
2. Ask a question
3. Form a hypothesis
4.Make a prediction
5. Test the predicition
Constellations - ✔✔One of the stellar patterns identified by name, usually of mythological
gods, people, animals, or objects; also, the region of the sky containing that star pattern.
Asterisms - ✔✔less formally defined groupings of stars ex. The Big Dipper is an asterism that
is part of the constellation Ursa Major (the great bar)
How many constellations are there according to the International Astronomical Union (IAU)? -
✔✔88
True or False? "All the stars in a constellation are at the same distance from Earth" -
✔✔FALSE
True or false? "Most named stars have names that come from Greek". - ✔✔FALSE - they
come from the arabic language
Where do constellations' names come from? - ✔✔Greek language
,Which star is brighter, Alpha Orionis or Beta Orionis? - ✔✔Alpha Orionis
What constellation is Epsilon Lyrae in? - ✔✔Lyra the Harp
What is the brightest star in the sky? - ✔✔Sirius
What is the brightest star in the summer sky? - ✔✔Vega
What is the name of the North Star? - ✔✔Polaris
Magnitude Scale - ✔✔the astronomical brightness scale; the larger the number, the fainter
the star
ex. First magnitude star - brightest
Sixth magnitude star - faintest to the human eye
When was the magnitude scale first used? - ✔✔-First appeared in writing the year 140 by
Claudius Ptolemaeus
-The magnitude system originated earlier from greek astronomer Hipparchus who complied the
first star catalogue.
apparent visual magnitude - ✔✔The brightness of a star as seen by human eyes on Earth.
Who is credited with the invention of the magnitude system? - ✔✔Hipparchus
True or False: "A star with magnitude 1 is brighter than a star with magnitude 3." - ✔✔TRUE
, What is the faintest apparent magnitude the human eye can see? - ✔✔6
True or False: "Stars can't have negative magnitudes." - ✔✔FALSE
Sun, Moon, Venus at its brightest
flux - ✔✔measure of the light energy from a star that hits a collecting area of one square
meter in one second.
Star A has magnitude 1. If Star B is 2.51 times brighter than Star A, what it the magnitude of
Star B? - ✔✔0
If Star C has magnitude 0 and is 100 times brighter than Star D, then Star D has magnitude ____.
- ✔✔5
Scientific Model - ✔✔An intellectual concept designed to help you think about a natural
process without necessarily being a conjecture of truth EX. Celestial Sphere - an imaginary
sphere of a very large radius surrounding Earth to which the planets, stars, Sun and Moon seem
to be attached.
Horizon - ✔✔The line that marks the apparent intersection of earth and sky
Zenith - ✔✔the point on the celestial sphere directly overhead
Nadir - ✔✔The point on the bottom of the celestial sphere directly below your feet
North Celestial Pole - ✔✔the point directly over Earth's North Pole
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