In natural science 'to explain' means merely to discover 'interconnexions.' For example, in one sense there is no explanation of the red which you see.

It is red, and there is nothing else to be said about it.

Either it is posited before you in sense-awareness or you are ignorant of the entity red.

But science has explained red.

Namely it has discovered interconnexions between red as a factor in nature and other factors in nature, for example waves of light which are waves of electromagnetic disturbances.