BYU Astronomy Phys 127 Final Part 1

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75 terms · taken with Dr. Joner winter 2012

The nearby open cluster known as the Pleiades is located in the constellation

Taurus

You are on a strange planet. You note that the stars do not rise and set, but circle around parallel to the horizon. Then you travel over the surface of the planet in a straight parallel line until you reach a place where you observe the stars rise and set perpendicular to the horizon. If the distance that you traveled between these two points is 6,500 miles, what is the circumference of the planet?

26000 miles

Relative to the stars, the moon moves __________ from one night to the next.

to the east

The Zodiac is

the constellations through which the Sun appears to travel in one year.

An observer located on the equator of the Earth notes one day that the center of the Sun crosses the meridian precisely 23.5 degrees north of the zenith. Therefore, the date is most likely

June 21

Star: Vega

Constellation: Lyra

Star: Deneb

Constellation: Cygnus

Star: Castor

Constellation: Gemini

Star: Capella

Constellation: Auriga

Star: Sirius

Constellation: Canis Major

Star: Altair

Constellation: Aquila

Star: Aldebaran

Constellation: Taurus

Star: Antares

Constellation: Scorpius

Star: Betelgeuse

Constellation: Orion

Star: Polaris

Constellation: Ursa Minor

An eclipse of the Moon can only occur when the moon is at _________ phase.

full

The main reason for it being hotter in summer than in winter is

the Sun is higher in the sky in the summer.

What is the range of values that the celestial coordinate declination can have?

-90 to +90 degrees

Polaris is presently the pole star, but it will not always be the pole star because the actual celestial pole moves among the stars due to the _____________ of the Earth.

precession

The horns of the crescent moon ALWAYS point

away from the Sun

Relative to the stars, a planet in retrograde motion moves __________ from one night to the next.

toward the west

The path that the Sun follows through the stars on the celestial sphere is known as

the ecliptic

An eclipse of the Sun can only occur when the moon is at

new phase

What is the range of values that the celestial coordinate right ascension can have?

0 to 24 hours

The nearby open cluster known as the Hyades is located in the constellation

Taurus

We live at 40° north latitude in Provo. How often is the Sun directly overhead at noon in Provo?

never

What was the major contribution made by Nicolaus Copernicus to astronomy?

He said that the Earth is not the center of the Universe.

What major contribution to astronomy was made by Tycho Brahe?

He made extensive and detailed observations of the positions of the planets.

What was the major contribution made to astronomy by Johannes Kepler?

He discovered that the planets move around the Sun in elliptical orbits.

What was one of the major contributions made by Isaac Newton to astronomy?

He developed a theory of gravity that could explain orbital motion.

Star: Pollux

Constellation: Gemini

Star: Rigel

Constellation: Orion

Star: Castor

Constellation: Gemini

Star: Capella

Constellation: Auriga

Star: Sirius

Constellation: Canis Major

Star: Procyon

Constellation: Canis Minor

Star: Aldebaran

Constellation: Taurus

Star: Spica

Constellation: Virgo

Star: Betelgeuse

Constellation: Orion

Star: Regulus

Constellation: Leo

At full moon the Earth would appear to an observer on the Moon to be at _____ phase.

new

Green light is of ______________ than yellow light.

higher frequency and shorter wavelength

Which of the following is a problem inherent to individual radio telescopes?

They have poor angular resolution.

Relative to the stars, the moon moves __________ from one night to the next.

to the east

What happens in our model of the atom when an absorption line is formed?

An electron moves from a lower energy level to a higher one.

What is the range of values that the celestial coordinate right ascension can have?

0 to 24 hours

If a telescope with an objective focal length of 5-feet is used with an eyepiece of 1/2 inch focal length, the resulting magnification will be:

120x

If an object is moving away from you, what effect do you observe in the object's spectrum?

it appears red-shifted.

Adaptive optics are used to correct what problem?

Effects of atmospheric turbulence

What is the primary advantage of the Hubble Space Telescope over ground-based telescopes?

It is above the atmostphere

Which of the following are the Jovian planets?

Jupiter, Saturn, Uranus, and Neptune

Which of the following defines density?

Mass divided by volume

What happens in our model of the atom when an emission line is formed?

An electron moves from a higher energy level to a lower one.

A telescope of large aperture is better than one of small aperture because of

greater resolving power

A body is heated until it appears red in color. It is then heated further until it appears bluish in color. The amount of red light it gives off ____________ as the body becomes blue.

increases

The series of lines in the spectrum of hydrogen known as the Balmer series are seen in the visible portion of the spectrum and are characterized by electron transitions up from or down to the level n =

two

What natural barrier tries to prevent two protons from combining?

Electromagnetic repulsion

Which of the following are the Terrestrial planets?

Venus, Mars, Earth, and Mercury

What is the primary ingredient in the Earth's atmosphere?

Nitrogen

The light we see from the visible surface of the Sun comes from which atmospheric layer?

photosphere

Asteroids associated with the Lagrange points in the orbit of Jupiter are called

Trojan asteroids

A parsec is defined as the distance to a star which has a parallax of ___ second(s) of arc.

1.0

A 5th magnitude star is ____ times brighter than a 15th magnitude star.

10,000

The apparent magnitude of the Sun is about

-27

The absolute magnitude of the Sun is about

+5

If you view a typical star with a spectrograph, what type of spectrum are you likely to observe?

Absorption

Which of these is the greatest distance? (1 light year, 1 billion km, 1 parsec)

One parsec

The absolute magnitude of a star is defined to be the apparent magnitude that the star would have if it were at a standard distance of ___ parsec(s).

10

A nearby star has a parallax of 0.5 arc second. What is its distance?

2 pc

What is the average length of time from one time of sunspot maximum on the Sun until the next time of sunspot maximum?

11 years

Which two physical properties contribute to the observed absolute magnitude or luminosity of an object?

surface temperature and size

The average rate of erosion on the Moon is far less than that on the Earth because:

the Moon lacks an atmosphere and free water

What result does the Greenhouse Effect have on the surface environment of Venus?

It has raised the surface temperature by hundreds of degrees Celsius

Polaris is presently the pole star, but it will not always be the pole star because the actual celestial pole moves among the stars due to the _______________ of the Earth.

precession

Venus has a feature named Aphrodite Terra. What is this feature?

A continental-sized plateau

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