ASTRONOMY QUESTIONs!! (please no links or fake answers) multiple choice 1. how does the location of the Sun in the Galaxy impact habitability? [select all that apply]

∆ it varies the number planets that can form in a solar system
∆it varies the frequency of supernova explosions
∆it varies the amount of heavy elements available
∆it varies the temperature of the Sun

2. Which of the following would be considered "direct" evidence for life elsewhere in the galaxy? [select all that apply]

∆ receiving a message from an extraterrestrial civilization
∆ detecting methane gas in the atmosphere of an exoplanet
∆ verifying that there's a liquid water ocean under the icy of Europa
∆ finding a fossil of a bacteria on Mars

3. many of the XO planets that have been discovered so far are called because of their size and temperature.

a) "hot Jupiters"
b) "cold earths"
c) "cold Jupiters"
d) "hot earths"​