4. Answer the question based on the information given below. The diagram here shows the planets of our Solar System as well as the direction in which they rotate and the angle at which their axes are tilted (obliquity). (Note: This is an older diagram and Pluto is no longer considered a planet of the solar system.) Mercury 0.1° Venus 177° Obliquity of the Nine Planets Earth 23° Group 1 Mercury Venus Jupiter Mars 25 Jupiter Group 2 Earth Mars Saturn Uranus Neptune Pluto Saturn 27° Uranus 98° Based on the information given in the diagram, Esha grouped the planets as shown in the table Pluto 120° T T Neptune 30° Copyright 1999 by Calvin J. Hamilton Which of the following is true about all the planets in group one when compared to those in group 2? a) They are larger planets F b) They are closer to the sun P c) The Sun rises from the west of these planets d) They have fewer variations across the seasons.
Answers & Comments
Answer:
The outer planets are gas giants Jupiter and Saturn and ice giants Uranus and Neptune. Beyond Neptune, a newer class of smaller worlds called
Answer: a) Jupiter b)Mercury c) Venus d) Changing seasons
Explanation:
Pluto, large, distant member of the solar system that formerly was regarded as the outermost and smallest planet. It also was considered the most recently discovered planet, having been found in 1930. In August 2006 the International Astronomical Union (IAU), the organization charged by the scientific community with classifying astronomical objects, voted to remove Pluto from the list of planets and give it the new classification of dwarf planet. The change reflects astronomers’ realization that Pluto is a large member of the Kuiper belt, a collection of debris of ice and rock left over from the formation of the solar system and now revolving around the Sun beyond Neptune’s orbit. (For the IAU’s distinction between planet and dwarf planet and further discussion of the change in Pluto’s classification, see planet.)
Pluto is not visible in the night sky to the unaided eye. Its largest moon, Charon, is close enough in size to Pluto that it has become common to refer to the two bodies as a double system. Pluto is designated by the symbol ♇.
Pluto is named for the god of the underworld in Roman mythology (the Greek equivalent is Hades). It is so distant that the Sun’s light, which travels about 300,000 km (186,000 miles) per second, takes more than five hours to reach it. An observer standing on Pluto’s surface would see the Sun as an extremely bright star in the dark sky, providing Pluto on average 1/1,600 of the amount of sunlight that reaches Earth. Pluto’s surface temperature therefore is so cold that common gases such as nitrogen and carbon monoxide exist there as ices.
Because of Pluto’s remoteness and small size, even the best telescopes on Earth and in Earth orbit could resolve little detail of its surface. Indeed, for decades, such basic information as its radius and mass had been difficult to determine. It was not until Pluto was visited by the U.S. spacecraft New Horizons, which flew by Pluto and its satellite Charon in July 2015, that many key questions about it and its environs were answered.
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