expert in or student of astronomy. Scientist studying stars and other bodies in space.

Opening part of a text or piece of music.

In a way that is obvious/easy to see or understand.

imagine as future possibility.

region surrounding earth or another astronomical body in which its magnetic field is predominant effective magnetic field.

Of a dull greyish-brown colour.. A subadult mayfly, which has drab coloration and opaque wings.. make persistent demands on someone.

Not of the same kind; unlike other things. alter coat of arms.

likely or prone to be affected by. conditionally upon. An area of study at school, e.g. math, history. To cause to suffer or experience something.

(Of a person) well-known and highly respected. To make something clearly different from others.

flash of lightning with simultaneous crash of thunder. Discharge of lightning accompanied by thunder.

having obligation to do something, or having control over or care for someone, as part.

Concerning the unproved aspects of a subject.

wreathed with laurel as honour. person honoured with award.

officially compulsory, or otherwise considered essential. To demand that someone does something.

A structure with a roof and walls, e.g. a house. To construct a house, office, factory.