The groups of stars in the sky can be termed as -

• Constellation:
English meaning: any of the groups of stars in the sky that seem from earth to form a pattern and have been given names.
Bangla meaning: একত্রে অবস্থিত নক্ষত্রপুঞ্জ।

Options,
ক) Comet:
English meaning: an object that moves around the sun, usually at a great distance from it, that is seen on rare occasions from the earth as a bright line in the sky.
Bangla meaning: ধূমকেতু।

খ) Solar system:
English meaning: the sun and the group of planets that move around it.
Bangla meaning: সৌরজগৎ।

ঘ) Orbit:
English meaning: the curved path through which objects in space move around a planet or star.
Bangla meaning: গ্রহণক্ষত্রের পরিক্রমণপথ; কক্ষপথ: The orbit of the earth round the sun.

Source: Cambridge & Accessible Dictionary.