Astro Test 1 - Assessment

Astro Test 1

Assessment

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Harrison Lipsey

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Hard

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88 questions

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Open Ended

30 sec

1 pt

The Solar system consists of

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Answer explanation

The Sun and all the objects that orbit it

Open Ended

30 sec

1 pt

The distance to a neighboring state could be

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Answer explanation

100 km

Open Ended

30 sec

1 pt

A Martian and a Venusian is debating about the units for expressing distances to stars. Whose parsec is bigger and by how much

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Answer explanation

The Martian's is about twice as big

Fill in the Blank

30 sec

1 pt

Approximately 1,000 Earths could fit inside Jupiter. Therefore, Jupiter's radius must be roughly _________ times larger than that of the Earth.

Open Ended

30 sec

1 pt

The bright star, Betelgeuse, is about 520 light-years away from us. If the speed of light were twice its current value, how far away would it be?

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Answer explanation

260 ly

Open Ended

30 sec

1 pt

The Crab Nebula is the supernova remnant observed by Chinese astronomers in 1,054 ACE. As the Crab Nebula is about 6,500 light-years away from us, the supernova must have occurred around the year

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Answer explanation

5,450 BCE

Open Ended

30 sec

1 pt

Relative to the age of the universe, how old is our solar system?

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Answer explanation

It is about one-third the age of the Universe.

Open Ended

30 sec

1 pt

Planet A and Planet B have the same angular size of the sky. Planet A is known to have a physical diameter of 2E4 km. Planet B is known to be 10 times further away from us than Planet A. Therefore, Planet B has a diameter of

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Answer explanation

2E5 km

Open Ended

30 sec

1 pt

An astronomer on the Earth measures parallax p for a nearby star. An astronomer on Mars would measure parallax for the same star as

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Answer explanation

greater than p

10.

Open Ended

30 sec

1 pt

If a star is 5 light-years away, this means that

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Answer explanation

It would take light 5 years to traverse the distance between the Earth and the star

11.

Open Ended

30 sec

1 pt

North celestial pole, an imaginary point on the celestial sphere, is

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Answer explanation

Directly above the Earth's North Pole

12.

Open Ended

30 sec

1 pt

Which statement about ecliptic is false?

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Answer explanation

The moon can never be on the ecliptic

13.

Open Ended

30 sec

1 pt

The orbital tilt of the Earth's rotational axis is 23.5◦. How would the Earth's season be different if the angle were increased to 30◦?

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Answer explanation

More intense seasons

14.

Open Ended

30 sec

1 pt

The orbit of the Earth has an eccentricity of e= 0.017 where e= 0 denotes a circular orbit while 0< e <1 form an elliptical orbit, for example. How would the Earth's season be different if the eccentricity were increased toe= 0.018?

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Answer explanation

No appreciable change

15.

Open Ended

30 sec

1 pt

Which of the following contributes to seasons?

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Answer explanation

The altitude of the Sun's rays and the amount of time that the Sun is above the horizon

16.

Fill in the Blank

30 sec

1 pt

From a latitude of 30◦N, the altitude of the North Celestial Pole is ________ above the north point.

17.

Fill in the Blank

30 sec

1 pt

From a latitude of 90◦S, the altitude of the South Celestial Pole is _______ above the south point.

18.

Open Ended

30 sec

1 pt

If the Earth had no orbital tilt (of 0◦), then

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Answer explanation

There would be no seasons and the direct sun lights would always shine on the equator and an observer on the equator would see the sun pass through their zenith every day and day and night would each be 12-hour long every day all over the Earth.

19.

Open Ended

30 sec

1 pt

The seasons on earth are caused primarily by

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Answer explanation

the tilt of the earth's rotational axis with respect to the ecliptic

20.

Open Ended

30 sec

1 pt

Seasons would not exist on the Earth if

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Answer explanation

The axial tilt were zero degrees instead of the current 23.5 degrees

21.

Open Ended

30 sec

1 pt

A point on the Celestial Equator, on the Ecliptic, and in time

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Answer explanation

The equinox

22.

Open Ended

30 sec

1 pt

You're stranded on a desert island. You locate the Polaris at 17 degrees above the northern horizon. What is your latitude?

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Answer explanation

17 degrees north

23.

Open Ended

30 sec

1 pt

Which of the following locations is the closest to the SCP? (a) (RA,dec) = (14h,+88◦) (b)(14h,−88◦) (c)(23h,+2◦) (d)(18h,+86◦) (e) (6h,+24◦)

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Answer explanation

(b)(14h,−88◦)

24.

Open Ended

30 sec

1 pt

Which of the following locations is the closest to the Vernal Equinox? (a) (RA, dec) = (14h, +88◦) (b)(14h, −88◦) (c) (23h, +2◦) (d) (18h, +86◦) (e) (6h, +24◦)

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Answer explanation

25.

Open Ended

30 sec

1 pt

Which of the following locations is the closest to the Celestial Equator? (a) (RA,dec) = (14h,+88◦) (b)(14h,−88◦) (c)(23h,+2◦) (d)(18h,+86◦) (e) (6h,+24◦)

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26.

Open Ended

30 sec

1 pt

If the Sun rises directly east on the vernal equinox, then three weeks later it will rise

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Answer explanation

north of east

27.

Open Ended

30 sec

1 pt

The fact that the moon always keeps the same face towards the earth means that

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Answer explanation

The moon rotates once in each revolution around the earth

28.

Open Ended

30 sec

1 pt

Which of these produces a total lunar eclipse?

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Answer explanation

The moon passes through earth's umbra

29.

Open Ended

30 sec

1 pt

The nodes in the moon's orbit are

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Answer explanation

places where the moon's orbit intersects the ecliptic

30.

Fill in the Blank

30 sec

1 pt

During a solar eclipse, the _____ is in the ________ shadow.

31.

Open Ended

30 sec

1 pt

Saros period is important and useful because it tells us

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Answer explanation

next eclipse

32.

Open Ended

30 sec

1 pt

If you see the Moon around 6 am, then its phase is approximately

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Answer explanation

third quarter

33.

Open Ended

30 sec

1 pt

Which two ideas of these (I) The Sun is at the center of the universe (II) All heavenly bodies move in combinations of perfect circles (III) The Earth is at the center of the universe (IV) The stars never move made Ptolemy's geocentric model very complicated and prevented it from correctly describing the actual movements of bodies in the Solar System?

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Answer explanation

II and III

34.

Open Ended

30 sec

1 pt

How did Eratosthenes measure the size of the Earth?

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Answer explanation

He measured the Sun's position in the sky at noon on the same date from two different cities

35.

Open Ended

30 sec

1 pt

What do we call the phase of the Moon when we see the left half of the Moon in the sky?

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Answer explanation

third quarter

36.

Open Ended

30 sec

1 pt

How long is the period of precession of the Earth's poles?

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Answer explanation

26,000 years

37.

Open Ended

30 sec

1 pt

The projection of the Earth's latitude onto the sky is called

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Answer explanation

declination

38.

Open Ended

30 sec

1 pt

After a given solar eclipse in a particular local region, the next one seen on the Earth will occur at a location that is

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Answer explanation

shifted by 120◦ along east-west

39.

Open Ended

30 sec

1 pt

What is the most fundamental difference between planets and stars?

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Answer explanation

Thermonuclear reaction

40.

Open Ended

30 sec

1 pt

1 AU (astronomical unit) is approximately

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10^11 m

41.

Open Ended

30 sec

1 pt

Approximately how far is it between us and the Galactic Center of the Milky Way Galaxy?

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Answer explanation

8 kpc

42.

Open Ended

30 sec

1 pt

Which one of the following is the largest? (a) radius of the Earth (b) 1 light-second (c) radius of the Sun (d) 1 AU

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Answer explanation

1 AU

43.

Open Ended

30 sec

1 pt

Which one of the following can be a correct unit for"parallax"?

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Answer explanation

radian

44.

Open Ended

30 sec

1 pt

What is the definition of 1pc (parsec)?

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Answer explanation

distance at which 1AU subtends an angle of 1 arcsec or 1"

45.

Open Ended

30 sec

1 pt

0.00423 is equal to

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Answer explanation

4.23*10^-3

46.

Open Ended

30 sec

1 pt

Can you compare the brightness/intensity of two stars by eye

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Answer explanation

47.

Open Ended

30 sec

1 pt

Which one of the following key words best describes the universe in modern cosmology? (a) extremely homogeneous constituents (b) stationary or steady-state (c) large-scale structure (d) infinitely large in size

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Answer explanation

48.

Open Ended

30 sec

1 pt

How does the Earth compare with the Sun in terms of how they rotate/spin?

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Answer explanation

The Earth's angular velocity is independent of the latitude; not true for Sun.

49.

Open Ended

30 sec

1 pt

The Milky Way Galaxy's rotational curve can tell us something about

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Answer explanation

the amount of invisible dark matter

50.

Fill in the Blank

30 sec

1 pt

The Hubble's law states that ______.

51.

Open Ended

30 sec

1 pt

A distant star at 700 light-years emits enough light to be observed at the Earth. Which one of the following is (the most) impossible?

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Answer explanation

The star could have been formed 600 years ago.

52.

Open Ended

30 sec

1 pt

What is believed to be present at the Milky Way's Galactic Center (GC)?

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Answer explanation

A supermassive black hole

53.

Fill in the Blank

30 sec

1 pt

The _____ is a circle/line on the celestial sphere that passes through the observer's zenith (the point directly overhead)and the north and south points on the observer's horizon.

54.

Open Ended

30 sec

1 pt

The angle between the ecliptic and the celestial equator is approximately

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Answer explanation

23.5 degrees

55.

Open Ended

30 sec

1 pt

The Reason for Seasons is that the earth is closer to the Sun in summer, while farther from the Sun in winter.

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Answer explanation

False

56.

Open Ended

30 sec

1 pt

Relatively speaking, the Earth's season is less dramatic near

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Answer explanation

the equator

57.

Open Ended

30 sec

1 pt

The Sun rises in the northeast and sets in the north west with the highest path for

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Answer explanation

Summer solstice

58.

Open Ended

30 sec

1 pt

Milankovitch cycles is intimately related to

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Answer explanation

the Earth's eccentric orbit, the Earth's tilt angle, the precession of the rotational axis of the Earth

59.

Open Ended

30 sec

1 pt

Right Ascension (RA) and Declination (DEC) are used in

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Answer explanation

the equatorial coordinate system

60.

Fill in the Blank

30 sec

1 pt

_____ is an area of the narrow sky centered upon 8-9° north or south of the ecliptic.

61.

Open Ended

30 sec

1 pt

Which one of the following coordinates, (RA, dec), is NOT expressed correctly? (a) (03h 34m 25.7s, -10deg) (b) (06h 12m 34.5s, 12deg) (c) (00h 00m 13.8s, 87deg) (d) (14h 05m 47.3s, -31deg) (e) (01h 45m 51.2s, 95deg)

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Answer explanation

(e) (01h 45m 51.2s, 95deg)

62.

Open Ended

30 sec

1 pt

The north star (i.e. Polaris) is seen 20 deg above your local horizon due north. Where are you?

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Answer explanation

at latitude 20 degrees north

63.

Open Ended

30 sec

1 pt

"Solar Days" and "Sidereal Days" are defined differently,and the former is ____ the latter.

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Answer explanation

longer than

64.

Open Ended

30 sec

1 pt

What are the coordinates of a star that lies exactly "halfway" between the vernal equinox and the north celestial pole?

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Answer explanation

RA = 00h 00m 00s, dec = 45 deg

65.

Open Ended

30 sec

1 pt

A star at RA = 04h 00m 00s and DEC = 30 deg must have

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Answer explanation

0 < RA < 60 degrees

66.

Open Ended

30 sec

1 pt

Tidal locking between a planet and its satellite normally sets in if

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Answer explanation

their masses are relatively similar and they are relatively close to each other

67.

Open Ended

30 sec

1 pt

During one month, an astronaut on the Lunar near side would see

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The Earth go through phases.

68.

Open Ended

30 sec

1 pt

Synodic month is ____ Sidereal month (in time).

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Answer explanation

longer than

69.

Open Ended

30 sec

1 pt

Solar eclipse occurs with (lunar phase)

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New moon

70.

Open Ended

30 sec

1 pt

Lunar eclipses are divided into different types according to

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the path of the moon

71.

Open Ended

30 sec

1 pt

Total lunar eclipse appears to be reddish primarily because of

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The Earth's atmosphere

72.

Open Ended

30 sec

1 pt

The solar "coronae" can be optically seen during ____.

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Answer explanation

Total eclipse

73.

Open Ended

30 sec

1 pt

Since one "saros" cycle is 18 years + 11 +1/3 days, the next similar solar eclipse in the same region of the globe will occur approximately in

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Answer explanation

54 years + 34 days.

74.

Open Ended

30 sec

1 pt

Which one of the following was the major reason why ancient Greek did NOT believe in heliocentric view?

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Answer explanation

failure to measure stellar parallax

75.

Open Ended

30 sec

1 pt

In an effort to construct a planetary model consistent with observations in ancient Greek times, what did they hypothesize?

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Answer explanation

Planets physically orbit in a retrograde fashion.

76.

Open Ended

30 sec

1 pt

Ancient Greek astronomers had believed that "Heavens must be perfect." In their mind, this means that

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Answer explanation

All the astronomical objects are moving on spheres or in circles.

77.

Open Ended

30 sec

1 pt

An ancient Greek philosopher/astronomer, Ptolemy, was the first to construct the geocentric planetary model where

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Answer explanation

planets follow epicycles.

78.

Open Ended

30 sec

1 pt

Who proposed a Sun-centered (heliocentric) model first in post-Greek astronomy?

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Answer explanation

Copernicus

79.

Open Ended

30 sec

1 pt

Which one of the following better characterizes the unique essence of Copernican planetary model?

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Answer explanation

Planets orbit around the Sun.

80.

Open Ended

30 sec

1 pt

Which one of the following is NOT true in Tychonic planetary model?

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Answer explanation

Planets orbit the Earth.

81.

Open Ended

30 sec

1 pt

What is the definition of "eccentricity" of ellipse?

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Answer explanation

focal length / semi-major axis

82.

Open Ended

30 sec

1 pt

Some planets have an eccentricity of 1

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Answer explanation

False

83.

Open Ended

30 sec

1 pt

Some planets have an eccentricity of 0

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Answer explanation

False

84.

Fill in the Blank

30 sec

1 pt

The orbit of each planet around the Sun is ____ with the Sun at _____.

85.

Open Ended

30 sec

1 pt

As a planet moves around its orbit, it moves ___ near the perihelion while ___ the aphelion.

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Answer explanation

faster, slower

86.

Open Ended

30 sec

1 pt

Kepler's 3rd law formula, p^2 = a^3, is only correct when you express the variables as?

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a in AU and p in year

87.

Open Ended

30 sec

1 pt

An asteroid orbits the Sun with the orbital period of 8 years.What is the average distance between the two according to p^2 = a^3 (Kepler's 3rd law)?

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Answer explanation

4 AU

88.

Open Ended

30 sec

1 pt

Galileo showed by his observations that Venus actually goes through a complete phase transition. Its direct consequence is that

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Answer explanation

Venus orbits the Sun.

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