Question 1:

Which of the following gases is commonly found in exoplanet atmospheres?

Explanation: Exoplanet atmospheres can contain a variety of gases, including oxygen, methane, carbon dioxide, and many others. Therefore, the correct answer is D) All of the above.

Question 2:

Which of the following methods is used to study exoplanet atmospheres?

Explanation: The study of exoplanet atmospheres involves using various methods, including spectroscopy (analyzing the light absorbed or emitted by the atmosphere), telescopic imaging (capturing images of the exoplanet and its atmosphere), and atmospheric modeling (using computer models to simulate the composition and behavior of exoplanet atmospheres). Therefore, the correct answer is D) All of the above.

Question 3:

Which of the following factors affects the composition of an exoplanet's atmosphere?

Explanation: The composition of an exoplanet's atmosphere is influenced by various factors, including its distance from the star (which affects the temperature and presence of volatile substances), the planet's size and mass (which influence its ability to retain an atmosphere), and volcanic activity (which can release gases into the atmosphere). Therefore, the correct answer is D) All of the above.

Question 4:

What is the primary role of an exoplanet's atmosphere in determining its habitability?

Explanation: An exoplanet's atmosphere plays multiple roles in determining its habitability. It can shield the planet from harmful radiation, regulate the planet's temperature by trapping heat, and provide essential gases, such as oxygen and carbon dioxide, for life as we know it. Therefore, the correct answer is D) All of the above.

Question 5:

What is an exoplanet's atmosphere primarily composed of?

Explanation: The composition of an exoplanet's atmosphere can vary, but one of the most common gases found is hydrogen (H₂). Other gases like helium (He), nitrogen (N₂), oxygen (O₂), carbon dioxide (CO₂), and methane (CH₄) are also present in certain exoplanet atmospheres. Therefore, the correct answer is C) Hydrogen (H₂).