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

Announcement of a new product or service.

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 debt collector or an insistent creditor.. make persistent demands on someone.

way people or things differ. 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.

very successful, authoritative, and commanding great respect. To make something clearly different from others.

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

Having the duty of dealing with something.

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 establish e.g. a reputation, over time.