The pseudoscience of astrobiology has less justification for its existence all the time. Using scenarios that look good on paper but have no evidence, astronomers are speculating that Earth's primordial atmosphere may have been blasted away by multiple impacts when the solar system was forming. (I didn't see any explanation about oxygen's presence in "old" rocks, belying the idea of an old atmosphere that was replaced later on.) These are people that believe in the Oort cloud, you know. The "impacts destroy atmospheres" concept does not bode well for planets elsewhere in the universe, even by evolutionary reckoning.
Additional observations and speculations are hostile to the future of astrobiology. There are people who use Sagan-esque speculations based on the presupposition that evolution is true, then play the odds that since there are so many stars and galaxies, there must be life out there. That hope has been diminished by 90 percent, due to space radiation. Star formation has supposedly halted in some galaxies (as if they were watching stars form in the first place). And more killjoys for astrobiology. Nope, the fact is that Earth was specially created hereabouts, full of life, and God has big plans.
You can read up on the stories by clicking on "Astrobiology Hopes Diminish". Also, what if you take "bio" out of astrobiology? You get astrology. Really, is there much philosophical difference? Click here to read "Astrobiology Has No Bio".