Fact

labelreadonly

notereadonly

The same quantity in the unit a reader actually thinks in.

5.97×10²⁴ kg is a number nobody has an intuition for and 1.00 M⊕ is the whole point of it. Two rows would separate them by the width of the panel; one row with a trailing gloss keeps the comparison where the measurement is.

pendingreadonly

Why the field is empty, in the universe's own terms. Set exactly when value is null.

valuereadonly

The reading, or null where the record has no entry.

Null is not an error and not an empty string — it is the honest answer, and pending is required alongside it. See the header: a row that is simply absent cannot distinguish "this body has none" from "nothing has measured it", and those are the two answers a planetarium most needs to keep apart.