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If people have not drilled to the core of the Earth, is the fact that the Earth's inner core is solid and the outer core is liquid just a mere hypothesis/theory?
TEMPERATURE The deeper you go, the hotter it gets. & Celsius 4,000° C 4,000 km 2,000 km & kilometers 5,000° C 6,000 km F F mi. - ppt download
Does Earth's Moon have a molten core, or is it cold hard rock all the way through? - Quora
How do we know that the outer core of the Earth is liquid? - Quora
How do they know how hot the center of the earth is? - Quora
G-type main-sequence star - Wikipedia
Is the Earth's core solid, liquid, or something else? - Quora
Why is the earth's core solid even it has a high temperature of 6000°C? - Quora
ISRO Missions and Discoveries - Civilsdaily
Moto Grime Guard - Tru-Tension AUS
Why is the earth's core solid even it has a high temperature of 6000°C? - Quora
Radiative energy flux variations from 2000 – 2020
TIL that the mere existence of other galaxies in the universe has only been known by humans for roughly 100 years; before that it was believed that the Milky Way contained every star in the universe. : r/todayilearned