Which stellar spectral type is most likely to have a planet on which advanced life exists?

Which element serves as the foundation or “backbone” of life?

What arguments could you make against sending messages via radio or spacecraft into interstellar space?

Try using the Drake equation with values that you find reasonable. How many civilizations do you estimate there are in our Galaxy?

Discuss the possible biological effects of our probes that visit other life-sustaining worlds.

What social effects might probes from other worlds have on us?

List some of the pros and cons in the argument that alien spacecraft have visited Earth.

Have astronomers found concrete evidence for the existence of extraterrestrial life? If so, please describe these discoveries.

Have scientists found credible evidence that extraterrestrials have visited Earth? Explain your answer.

Has life been created in the laboratory? If so, when and where?