Why do some people think these things are useless?
Have they ever peered into the night sky through a telescope lens... or even simply lay back and looked at the stars?
What's wrong with trying to visit, learn about or getting up to speed to one day live in a faraway place? It was okay to go to America and Australia.
Why is it useless unless it subsidizes social programs?
To be human is to be material and spirit. O, how we sow to the body! Gimme dis! Gimme dat! I want my check! "They" owe it to me! We still got (us) poor people here on Earth, what business do they have to go to space? The nerve!
This is why our schools need more funds poured into them at the expense of research, art, or other truly human endeavors; "I'm here, teach me! It's your job and I want everything I'm ENTITLED to!"
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Take no thought as to what you will eat or what you will wear. Your Heavenly Father knows you need these things. Look at the lilies of the field; (Yeah, please do! In fact, there may not be life outside of our blue and white jewel, but there are blooms everywhere anyhow.) they neither spin nor toil, yet Solomon in all his grandeur was not clothed like one of them! The heavens declare the Glory of the Lord. Day and night they pour forth speech. Oh? So you were there when I laid the foundations of the Earth and the sons of God (stars) sang for joy? Brace yourself like a man and answer, if you know. Bold and arrogant, they slander even celestial beings, not even angels, who are more powerful, dare to bring these accusations before God; they speak about things they don't truly understand, like brute beasts, born to be caught and destroyed.