Equation 3 · Part 2 · How We Know What Is Inside a Planet
superscript
superscript
What this part means
A raised number can be a power. When it is a label or bound, it selects a case or the upper limit of a sum; the formula’s structure distinguishes these uses.
Its job in the formula
A raised mark can be a power or an index. Its position and the surrounding notation determine which.
Full expression→superscript→Article meaning
The passage around this formula
What a moment-of-inertia factor rules out is more reliable than what it establishes. It is a single number, so it cannot distinguish a small dense core under a light mantle from a larger, less dense core under a heavier one; infinitely many radial density profiles share the same . But it will refuse an entire class of models outright. For Mercury, MESSENGER radio tracking combined with spin measurements gave C/M = 0.353 0.017 together with a ratio of mantle-plus-crust moment to total moment of 0.452 0.035 , a combination consistent with a solid silicate outer shell over an iron-sulfide layer, a liquid iron-rich outer core and possibly a solid inner core [ 7 ] . Seven years…
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 →
Sources cited in the surrounding passage
- [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.