If you see a bright object in the night sky, then which of the following observational feature(s) will lead you to conclude that the bright object is a planet?(Select All the answers that are correct)Group of answer choicesthe object travels from one zodiac constellation to another zodiac constellation over the period of a month to a few yearsthe object travels in one direction, then appears to reverse direction and moves backward, only to resume its original direction over the course of a few monthsthe object remains the the same constellationthe object travels in one direction and remains the same brightnessthe object twinklesthe object does not twinkle
Question
If you see a bright object in the night sky, then which of the following observational feature(s) will lead you to conclude that the bright object is a planet?(Select All the answers that are correct)Group of answer choicesthe object travels from one zodiac constellation to another zodiac constellation over the period of a month to a few yearsthe object travels in one direction, then appears to reverse direction and moves backward, only to resume its original direction over the course of a few monthsthe object remains the the same constellationthe object travels in one direction and remains the same brightnessthe object twinklesthe object does not twinkle
Solution
The correct answers are:
- The object travels from one zodiac constellation to another zodiac constellation over the period of a month to a few years.
- The object travels in one direction, then appears to reverse direction and moves backward, only to resume its original direction over the course of a few months.
- The object travels in one direction and remains the same brightness.
- The object does not twinkle.
These are all characteristics of planets as observed from Earth. Planets move across the sky in relation to the stars, which is why they can appear to move from one zodiac constellation to another. This apparent motion is due to the orbit of the planet around the Sun. The apparent reversal of direction, known as retrograde motion, is caused by the relative motion of Earth and the planet. Planets also tend not to twinkle, unlike stars, because they are closer to us and thus appear as small disks rather than point sources of light. The brightness of a planet remains relatively constant, although it can vary slightly due to changes in distance and angle of illumination.
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