First reading:
1st: presenting a new finding (including shifting view)
2nd: view has been challenged
3rd: experiment about the finding
4th: the further experiment result and analysis.
Main idea guessing: present and discuss the validity of new finding of Mercury.
Second detailed reading:
1st: the new radar study has found out that mercury is hot stuff, which partially molten. The finding not only solves the debate on planets but also provide insight of plants creation in solar system. Considering the size of Mercury, the planet ought to have cooled and solidified long ago
2nd: the above abruptly shifting view has been challenged because of magnetic field, which normally generated within a liquid core. However, it still possible just the remnant in the crust.
3rd: the experiments to testify the partially liquid theory. If core present as predicted, solar gravity has a great effect on planet's spin.
4th: after 6 years experiment, they conclude that mercury remains molten because of sulfur's melting temperature lowering effect on core.
• Mercury: molten
○ How planets created
• Debate
○ Astronomers: Mercury = cool and solidated
§ 1/3 far from the sun
□ But Sunlight < heat
§ Smaller size
○ Challenge
§ 1974 Mercury : magnetic field
□ e.g. Earth: liquid core
□ Another possible: magnetic field is remnant
§ New research: measure variation in spin
□ Sun → spin: vary
® Partially liquid
§ After 6 years
□ Variation: double (if solid)
® outer core=liquid
□ Reason
® sulfur enter the core→ melting temperature↓
® But high temperature→sulfur = a vapor
◊ Grabbed sulfur : beyond immediate surroundings