1. It was believed that ............. is the center of the universe.

Earth

sun

moon

space

2. giant ............. is discovered in 1781.

Neptune

Uranus

Jupiter

Venus

3. what is the meaning of liquid in English?

صلب

سائل

غازي

خامل

4. what is the meaning of thermal in English?

حراري

هوائي

معدني

خامل

5. what is the meaning of solar in English?

قمري

أرضي

شمسي

هوائي

6. what is the meaning of asteroids in English?

نيازك

كويكبات

نجوم

أقمار