Memory & Forgetting
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With reference to the structure of the solar system and the universe and the motion of celestial bodies, consider the following statements:
- 1. Most of the mass and angular momentum of our solar system is contained in the Sun, and the energy production within the Sun mainly occurs through the 'Proton-Proton Chain' nuclear fusion reaction, under which four hydrogen nuclei combine to form one helium nucleus.
- 2. The Asteroid Belt is mainly located between the orbits of Mars and Jupiter, where 'Ceres' is the largest dwarf planet, and this belt was prevented from consolidating as a large planet due to the powerful tidal forces of Jupiter.
- 3. The Oort Cloud, which is a vast spherical envelope of icy celestial bodies located at the outermost boundary of the solar system, is considered the main source of long-period comets, and it is located at the extreme end of the Sun's gravitational field.
- 4. According to data from the Hubble Space Telescope and the James Webb Space Telescope, the expansion of the universe is occurring at a constant speed, mainly caused by the attractive force of 'Dark Matter', which brings galaxies closer together.
Which of the above statement(s) is/are completely true?
✓ Correct! Well done.
✗ Not quite — the correct answer is highlighted above.
Detailed Explanation
According to the detailed analysis of this question, statements 1, 2 and 3 are completely true. The main means of energy production in the Sun is the fusion of hydrogen into helium (Proton-Proton Chain). The asteroid belt is located between Mars and Jupiter and Ceres is its largest dwarf planet. The Oort cloud is the source of long-period comets. However, statement 4 is false because the expansion of the universe is taking place at an accelerated expansion, and 'Dark Energy' is responsible for this accelerated expansion, not dark matter (which produces gravitational attraction).
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