Equation 2 · Part 1 · How We Know What Is Inside a Planet
Symbol I^*
What this part means
is part of the quantity the equation computes from the expression on the right.
Its job in the formula
is part of the quantity the equation computes from the expression on the right.
Full expression→Symbol I^*→Article meaning
The passage around this formula
and it measures how mass is distributed radially rather than how much there is. A uniform sphere has = 0.4 . Anything smaller means mass concentrated toward the centre; anything approaching 0.4 means a body that is close to uniform in density, which for a rocky planet means undifferentiated.
Learn the underlying idea
An exponent tells how a base is used in multiplication. In x³, x is the base and 3 is the exponent: x³ = x × x × x.
Open the illustrated exponents: repeated multiplication and powers guide →
See this notation across published equations →
Sources cited in the article section
- [7] Gravity field and internal structure of Mercury from MESSENGER ↗
- [9] Geodetic evidence that Mercury has a solid inner core ↗
These citations provide research context; check each source for the exact claim it supports.