"Kesy blēno naejon issa?"

[fp8LO0pf]

Shouldn't it be 'Keson blēno naejon issa' as 'naejon' is terrestrial?

[Likhithmaadhav]

'Kesy' is the substantive form used when not followed by any particular noun.
'Keson naejon' where naejon is in the nominative form is a correct expression. 'Keson bleeno naejon' where naejon is in the accusative form is not.

[StephieRice]

Naejon is not in the accusative. Issa does not make anything take the accusative