1. What does nuclear fusion in the Sun primarily refer to?
2. In which year was Pluto reclassified as a dwarf planet by the International Astronomical Union?
3. What is the role or purpose of solar and lunar eclipses in understanding celestial mechanics?
Sun's core process
Nuclear fusion converts hydrogen into helium.
Moon's surface features
Craters, maria, highlands, and impact records.
Eclipse conditions
Alignment near nodes; syzygy of Sun, Earth, Moon.
Sun's energy source?
Nuclear fusion in the core.
Photosphere — temperature?
About 6,000°C.
Sunspots — cause?
Magnetic activity.
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