Question

1. If a supernova were to occur within ___ parsec of Earth, the high-energy particles would obliterate the ozone.

A) 1 B) 5 C) 10 D) 20

2. In the galactic habitable zones section it states that the building blocks of planets are metals.

What are metals?

A) Elements other than hydrogen and helium B) Elements other than the noble gases C) Carbon, Nitrogen, and Oxygen D) Iron, Copper, Aluminum, Nickel, etc.

3. How does the Circumstellar Habitable Zone change as the temperature of the star evolves?

4. How is the circumstellar habitable zone location effected by the temperature of the star, and what is the the range for CHZ around the Sun presently?

Answer 1

1. If a supernova occurs within 10 parsec, the ozone would be obliterated. option C

2. In astronomy, all elements heavier than hydrogen and helium are termed as metals. option A

3. As the star evolves, it grows hotter and therefore, the habitable zone moves farther away from the star.

4. A planet in Habitable zone must essentially have liquid water. Therefore, this zone should neither be too near, nor too far away from the star. Temperature plays an important role in determining the state of water, so for cooler stars, the zone will be closer while for hotter stars, it will be farther.

present range of CHZ is 0.9 AU to 2 AU