How are galaxies important to our existence?
A) Without galaxies, there could not have been a Big Bang.
B) Without galaxies, the universe could not be expanding.
C) Galaxies prevent planets from leaving their orbits around stars; e.g., our galaxy prevents Earth from leaving its orbit of the Sun.
D) Galaxies recycle heavy elements produced in stars into future generations of stars.
E) Galaxies provide the gravity that prevents us from falling off Earth.
Answer: D
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Astronomy Chapter 1
- Which statement about the first quarter moon is FALSE?
- The last quarter phase of the Moon:
- While watching a star, you see it moves 15 degrees across the sky. How long have you been watching it?
- You note that a particular star is directly overhead. It will be directly overhead again in:
- If your astrological sign is Aries, the Sun should be in the constellation Aries on your birthday. The dates, according to astrological tradition, during which the Sun is in the constellation Aries are March 21 to April 20th. In which constellation is the Sun actually in, during this time period?
- Where would you be if the Sun sets for six continuous months, beginning on September 23rd?
- Where would you be if the Sun passes through your zenith on December 21st?
- When the Sun rises, it is located in the constellation Gemini. When the Sun sets later that same day, it will be:
- Which statement about the length of a day is FALSE?
- If Taurus is now rising at sunset, which constellation will rise at sunset next month?
- According to figure 1.15 in the textbook, in January the Sun is the constellation
- If Earth orbited the Sun in 9 months instead of 12, then, compared with a sidereal day, a solar day would be
- Which physical property of Earth gives rise to the seasons?
- Night and day have approximately equal length at what time or times of the year?
- Which of the following is NOT true about the astronomical feature is known as the "ecliptic"?
- From a location in the United States of America, a star is observed to be rising due East. Where will this star be located 6 hours later?
- Which solstice or equinox?
- Which solstice or equinox?
- The celestial sphere appears to move fastest about the ________.
- About how many stars are visible on a clear, dark night with the naked eye alone?
- Into how many constellations in the celestial sphere divided?
- What are constellations?
- T/F From the South Pole, Polaris would appear directly overhead.
- A long, thin cloud that stretched from directly overhead to the western horizon would have an angular size of
- The angular size of an object depends on which two quantities?