Lessons 1.1-1.3 -Interactive Lessons- ASTR 100 UIUC

So, every month my planet has a lunar eclipse. Since it is a lunar eclipse, our Moon must be in what phases? A. Full B. Any Phases C. New

A. Full

Is the percentage of illumination changing as the Moon revolves around the Earth? A. Yes B. No

B. NO (both the Earth and the Moon are illuminated the same-- 50% is lit. )

When the observer on the the Earth looks at the Moon, how much of the illuminated side of the Moon can they see? (standing in direction of sunlight with moon above) example: seeing moon when the sun is out A. 0% B. 25% C. 50% D. 75% E. 100%

A. 0%

"As I said, the Bellian Moon is the most beautiful Moon in the Galaxy. It is slightly gray-white and about the same size as yours. Once every month it becomes red as fire." What astronomical occurrence is happening? A. Lunar Eclipse B. Solar Eclipse C. Change in the distance from Bellonia and the Moon

A. Lunar Eclipse

f you were at the North Pole and a star was viewed to be directly at the Eastern horizon at sunset, when would that star set? A. Never. B. In 24 hours. C. In 12 hours.

A. Never

Solar Eclipse: This can only happen during which phase of the Moon? A. New B. Full C. Any phase

A. New (The Moon can only pass between the Sun and Earth during the New Moon phase)

What is the phase of the Moon where the far side is in complete daylight? A. New Moon B. Full Moon

A. New Moon (The New Moon is the phase when the near side of the Moon is not illuminated by the Sun, so that means that the far side is illuminated)

Look closely at the size of the Sun in each image. Which one of these figures was taken in January? " A. The image on the left. (LARGER SUN) B. The image on the right. (SMALLER SUN)

A. The image on the left. (LARGER SUN)

Since we now know the cause of the star trails in Josch's image (rotation of the Earth), we can estimate how long it took to make this image. Approximately how long? A. 1 hour B. 12 hours C. 24 hours D. 6 months E. 1 year

B. 12 hours

The star Betelgeuse in Orion is about 640 light years away. This means that: A. It would take us 640 years to reach the Earth from Betelgeuse. B. Betelgeuse is 640 times the distance that light travels in 1 year. C. Betelgeuse is 640 years ahead of us in the Galaxy.

B. Betelgeuse is 640 times the distance that light travels in 1 year.

Lunar eclipses, just like Lunar phases, only depend on the relative position of the Earth, Sun, and Moon and have nothing to do with shadows on the face of the Moon. A. True B. False

B. False (Lunar eclipses only occur when the moon is at full moon and on the opposite side of the sun dark side)

One can only see a lunar eclipse during which phase of the Moon? A. New B. Full C. Any phase

B. Full

Are constellations clear images on the sky? A. Yes, Orion is obviously a hunter. It couldn't be anything else. B. No, they are only vague outlines that could be re-imagined to be other images.

B. No, they are only vague outlines that could be re-imagined to be other images.

Betelgeuse is a bright red star in the constellation of Orion (see above Figure). Betelgeuse is 640 light years away from the Earth. The star Alnilam is the middle star of Orion's belt. Alnilam is 1360 light years away from Earth. Proxima Centauri, the closest star to Earth, is 4 light years away, but it is on the other side of the sky from the constellation of Orion. Which star is Betelgeuse actually physically closer to? A. Alnilam B. Proxima Centauri

B. Proxima Centauri

During which of the four periods below is the Sun highest in the sky at midday in the northern hemisphere? A. Spring Equinox B. Summer Solstice C. Fall Equinox D. Winter Solstice E. The sun rises to the same height in the sky every day

B. Summer Solstice

What causes the Sun to rise in the East and set in the West? A. The Sun's orbit around the Earth. B. The Earth's rotation. C. The Earth's orbit around the Sun. D. The Moon's orbit around the Earth. E. I'm not sure. What does rotation or orbit mean anyway?

B. The Earth's rotation.

Watch the video and carefully study the animation above. What does the highlighted region toward the north celestial pole represent? A. The pole of the celestial sphere. B. The region in which a star is considered circumpolar (never setting). C. The horizon. D. The Milky Way Galaxy.

B. The region in which a star is considered circumpolar (never setting).

If the constellation Orion is at its highest point at midnight in late January, where will Orion be in 3 months time at midnight? A. Eastern Horizon B. Western Horizon C. Highest point in the sky D. Not visible at all E. Only up during the day

B. Western Horizon

f you lived on the Moon, how long would 1 day (i.e. sunrise to sunset) take? A. 24 hours B. Infinite C. 1 Earth month D. 1 Earth year

C. 1 Earth Month

Which of the following is not a major component of a solar system? A. Planets B. Star C. Dark Matter D. Asteroids E. Comets

C. Dark Matter

How will a star directly overhead at the equator move over one day? A. It will stay overhead. B. It will move to the northern part of the sky and then move back to the southern part of the sky. C. It will set in the West, then rise in the East.

C. It will set in the West, then rise in the East.

For those people not in either the umbra or the penumbra, what type of eclipse will they see? A. Total B. Partial C. None

C. None (Since they are not in the shadow, they would not see an eclipse.)

When would a New Moon be at its highest point in the sky (if you could see it)? A. Midnight B. Any time C. Noon D. Sunset E. Sunrise

C. Noon (The New Moon is when the Sun and Moon are aligned. So, the location of the Moon should follow the Sun. The Sun is highest in the sky at noon)

"Here is today's question, Earthling. Unlike your ugly planet, my planet Bellona is perfect. It does not have an unsightly tilt to its orbit nor do we have any stars along our North Celestial Pole. From my Spring home, which is 40 degrees north of the Bellona equator, I see a star rise due East. "When that star reaches its highest point in the sky, where will it be?" A. Slightly North of zenith B. At the South Celestial sphere pole C. Slightly South of zenith D. Directly overhead (the zenith) E. At the North Celestial Sphere pole

C. Slightly South of zenith

"Here is today's question. Unlike your ugly planet, our planet Bellona is perfect. It is always Summer at the equator and always winter at the poles. There are no inconvenient seasons. We choose to visit and live in the environment that we want. Your planet has seasons, which is annoying. The question is why are our planets so different?" A. Bellona is probably a more massive planet like Jupiter. In other words, like Jupiter, no seasons. B. The orbit of Bellona is a perfect circle which means the planet does not have the 3% difference in distance. In other words, no seasons. C. The tilt of Bellona is 0 degrees, which makes its sun always rise due east and set due west. In other words, no seasons. D. The tilt of Bellona is 90 degrees, which makes its star always face one pole. In other words, no seasons.

C. The tilt of Bellona is 0 degrees, which makes its sun always rise due east and set due west. In other words, no seasons.

In the image above, the moon is in what phase? Hint, it is lit on the right. (Half matter dominant on east, right) A. Waning Crescent B. First quarter C. Waxing Gibbous D. Waning Gibbous E. Waning Third

C. Waxing Gibbous

Scorpius is a Summer constellation, so where is Scorpius during the Winter? A. In the Southern hemisphere. B. At the North Pole. C. The stars move into different alignments. D. It is up during the day, so it can't be seen.

D. It is up during the day, so it can't be seen.

Okay, last question. On your planet a lunar eclipse only happens a few times a year, but for us superior beings, we get beautiful lunar eclipses every Month. Why? A. The Bellian Moon is twice as large. B. The Bellian atmosphere is less dense making a brighter red color. C. The Bellian Star is brighter by a factor of 2.5. D. The Bellian Moon's orbit does not tilt at 5 degrees.

D. The Bellian Moon's orbit does not tilt at 5 degrees.

Use the app (or another resource) to detemine which Moon phase has about 75% of the lit surface visible and rises around 9pm? A. Waxing Crescent B. Waning Crescent C. Waxing Gibbous D. Waning Gibbous

D. Waning Gibbous (Waxing means that the Moon is headed to full moon and waning means the Moon is heading to new moon. Crescent is a small slice of Moon and Gibbous is a large lit portion.)

In the above image, when the observer on the the Earth looks at the Moon, how much of the illuminated side of the Moon can they see? (No sunlight with moon above) A. 0% B. 25% C. 50% D. 75% E. 100%

E. 100%

If it is noon in Illinois, then where on the Earth is it closest to midnight?" A. San Francisco, California B. Madrid, Spain C. Moscow, Russia D. Brasilia, Brazil E. Dhaka, Bangladesh

E. Dhaka, Bangladesh