IGCSE U11 Space

What term describes the theoretical model explaining the origin of the universe from a dense and hot initial state approximately 13.8 billion years ago?

• a) Dark Energy
• b) Big Bang Theory
• c) Main Sequence Star
• d) Nebula

What is the name for the vast collection of stars, planets, interstellar gas, and dust bound together by gravity, including the Solar System?

• a) Milky Way Galaxy
• b) Nebula
• c) Dark Mass
• d) Artificial Satellites

Which type of celestial body orbits a planet, either naturally occurring or man-made?

• a) Circular Orbits
• b) Dark Energy
• c) Artificial Satellites
• d) Natural Satellites

What phenomenon is believed to drive the accelerated expansion of the universe and constitutes about 68% of its total energy density?

• a) Protostar
• b) Dark Energy
• c) Main Sequence Star
• d) Nebula

What is the term for the invisible matter in the universe that does not emit or interact with electromagnetic radiation, yet exerts gravitational effects on visible matter?

• a) Dark Mass
• b) Circular Orbits
• c) Dark Energy
• d) Natural Satellites

What is the phase of a star's evolution when it is fusing hydrogen into helium in its core, representing the longest stage of its life cycle?

• a) Nebula
• b) Main Sequence Star
• c) Protostar
• d) Artificial Satellites

What type of orbit follows a circular path around a central body, such as a planet or star?

• a) Artificial Satellites
• b) Circular Orbits
• c) Dark Energy
• d) Dark Mass

Which term refers to the early stage in the formation of a star, characterized by the collapse of a gas and dust cloud under gravitational forces?

• a) Milky Way Galaxy
• b) Protostar
• c) Main Sequence Star
• d) Natural Satellites

What term describes large clouds of gas and dust in space, where stars are born?

• a) Dark Energy
• b) Milky Way Galaxy
• c) Nebula
• d) Circular Orbits

What objects are intentionally placed into orbit around Earth or other celestial bodies for various purposes such as communication, navigation, or scientific observation?

• a) Main Sequence Star
• b) Artificial Satellites
• c) Protostar
• d) Dark Mass