Necessary? No. Not much except eating, drinking and breathing is. Even reproduction is optional from the view of a single individual.

A good idea? Absolutely:

1. Exploring space tells us a lot about earth. We currently assume that the moon formed when something big collided with earth and threw lots of material into a stable orbit. This means moon is probably made of the same materials as earth and because there is no erosion nor tectonic activity on the moon, it lets us study what earth may have looked like billions of years ago.
2. Lots and lots of things that were originally developed for space are very useful on earth: teflon coating, memory foam matresses, efficient solar panels and many more. Sure, they could have been developed without space exploration but the pressure to get something exactly right helped a lot. And of course we directly use satellites for a lot of earth stuff, too. Think tv, weather prediction, monitoring of climate change, communication, GPS, accurate maps and many more.
3. It gives humanity something to unite behind. Even during the cold war, the USA and the Soviet Union ignored their feud for a bit to make Apollo-Soyuz happen. These days, the ISS is one of the biggest multinational projects and I dread the day it gets decommissioned because Russia will have one less reason to talk to the rest of the world.

Space exploration is weight lifting for science.

The impact to society from space exploration is immense if not immeasurable.

• Weather forecasting
• GPS navigation
• Earth sciences
• Robotics
• Medical imaging

NASA has a website dedicated to the topic, as do other agencies around the world.

• https://www.nasa.gov/humans-in-space/benefits-to-humanity/
• https://www.asc-csa.gc.ca/eng/about/everyday-benefits-of-space-exploration/
• https://www.space.gov.au/why-space-matters
• https://www.esa.int/Science_Exploration/Space_Science/Benefits_of_space_science

There’s also a Wikipedia page on the topic:

• https://en.wikipedia.org/wiki/Benefits_of_space_exploration

All attempts to discover how the universe works benefits us. Even a lot of really esoteric stuff has proven useful in fields like medicine and civil engineering.

Honestly if we can pivot our high tech innovation efforts from being mainly driven by military to being driven by basic research (basic in this case meaning researching the natural world directly without any particular goal other than learning), we’d be a lot better off.

Yes

Let me rewrite your question, and correct me if I’m misrepresenting it:

“Why should we spend resources on X instead of Y?”

Well, for this kind of question, I would prefer to choose a “high value” X and an “important” Y.

Space exploration, and science as a whole, is extremely cheap and good for humanity.

Let’s talk about other expensive “X” first:

• Unnecessary war efforts.
• ICE (if we are taking about US)
• Saving banks when they screw up on their bets.
• Incentives to coal and gas when solar is already more viable …

Maybe you started to think about it because that’s an amazing subject, and it is. That alone should be reason enough for us to want to do it. But it is not the only reason. Space exploration already gave us a lot of tech we rely on today. And still, is a very difficult field that will require more tech advancements, that will benefit us in the future.

Necessary, yes. Furthering our knowledge of the cosmos is a worthwhile pursuit for its own sake. That being said, the sudden focus on NASA is pure political distraction, a clumsy attempt to foment nationalism that isn’t going to be as effective as its architects were hoping.

yes. there’s two branching discussions here:

• Space as a scientific topic, it needs to be understood. Our observation of reality is very local, and although we can prove that some of our assumptions about physics, life and civilization work on our neighborhood, it doesn’t mean that they’re the same everywhere. That alone is sufficient reason for me, to explore.
• Space as the new frontier. Many if not all exploration done on planet Earth has been, in some shape or form, resource-motivated. Lands, food, medicine, minerals, routes, are all found through exploration and normally through people spending money looking for a return over investment. Space is no different.

I think the interesting part is where this two branches touch: If we ever plan on capturing an asteroid for mining, the technology needs to be there to do it, and hopefully the technology is about the benefit of all humankind. This kind of development is showing us the way to move forward and solve problems. Imagine a world when we don’t need to destroy ecosystems in order to get iron because all iron comes from off-world.

Yes, but capitalists should not do it. And actually space exploration on today’s scale cost literal pennies compared to military or shareholders loot.

Yes. For those who consider it wasteful spending, consider that a lot of problems are not fixable by just throwing more money at them. There’s a saying that “9 women can’t make a baby in one month” even though 1 woman can in 9. Many ills of society are as much about political/social motivation, entrenched opponents/regulatory capture, NIMBYism, etc and not problems that you can fix just by spending more. There’s also the concept of a “marginal dollar” - spending one more dollar in an important area that already has a lot of money (and has problems that aren’t really addressed by just having more money) may not be as impactful as a less important area where that dollar would go a lot further.

Absolutely and unequivocally yes. Nothing should constrain the boundaries of scientific study in space, especially now that our years are numbered due to climate change and dumbass fascists and dictators with launch codes. Whities on the moon, while a noble and valuable sentiment, should be altered to whities on patrol or something.

I’m so sick and tired of seeing Americans bitch about space exploration colonialism and remain silent on the colonialism that continues to kill and exploit Innocent people across the world.

Yes, we need better social infrastructure desperately, but that should come at the cost of terrestrial imperialism, not space exploration.

Looking at the list of government expenditures, I don’t see space exploration as problematic as other things we are spending money on.

The point is the advancement of science, not simply the travel itself. Space science is integral to many advances we take for granted these days.

Yes, we need to do things like space exploration because these are the endeavours that advance humanity. Even in practical terms, plenty of discoveries that are useful here come from technologies developed for space exploration. If you’re really worried about unproductive use of resouces, maybe worry about how we deal with the pedo elites that rule over us and hoard resources on unimaginable scale.

The word necessary has a lot of wiggle room here. What are necessities? Going by the bare minimum:

• food
• water
• protection from the elements
• protection from illness/infection
• continuation of the species

That’s about everything we truly ‘need’ to die of old age and not go extinct. Nearly everything people currently do is a subset of those needs. Space exploration can be marked under both protection from the elements and continuation of the species.