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One day when I was growing up, over dinner at a friend’s house, his parents told me they’d read some of the stories I wrote for fun. They thought I had real talent. I might even be a published author someday — if only I would stop wasting my time with all those spaceships and aliens.

I know it was meant as helpful advice but still, I was caught unprepared. I had never before considered time spent reading or writing the stories I loved to be a waste of time. I had certainly never considered my favorite genre to be inherently inferior to “more serious books.” And I absolutely rejected the implication that books on speculative topics couldn’t be as well crafted as any others.

Heinlein, Clark, Asimov, L’Engle, Wells, Norton, Bradbury, and Verne were just a few of the luminaries who happened to not be sitting at the dinner table with us that night, so it was up to me alone to defend the honor and integrity of science fiction. But I was twelve or thirteen at the time, and just mumbled something into my spaghetti.

My favorite defense these days is to imagine that we have a time machine that we can use to visit the somewhat distant past, after the invention of fire but before wheels, airplanes, and smartphones.

When our Neolithic ancestors weren’t searching for food, fighting the elements, or fending off predators, they spent their free time asking questions about the world around them.

Question: How old is the world?

Our Neolithic ancestors could ask around, but not even the oldest of the tribal elders could remember back to the start of the world.

Answer: Nobody knows.

Question: What is the world made of?

Our Neolithic ancestors could break chunks of stuff into tiny specks of stuff, but there was no telling what those specks were made of.

Answer: Nobody knows.

Question: How far up does the sky go?

Our Neolithic ancestors could throw a rock upward from a hilltop or tall tree without hitting anything, or estimate the height of a soaring bird, so at least a little higher than that.

Answer: Nobody knows.

Question: Why do things fall?

Our Neolithic ancestors could observe that things always fall downward when you drop them. Except when you catch and release a bug. So what do the bugs know that people don’t?

Answer: Nobody knows.

Question: Where did all the animals and plants come from?

Our Neolithic ancestors were familiar with the wide variety of forms that life takes on Earth. Some forms were similar to others—were they designed that way? If so, by whom? Was the creation of life an ongoing process, with new kinds of plants and animals still sometimes popping into existence? There were no answers.

Answer: Nobody knows.

Imagine how frustrating it must have been for our Neolithic ancestors to have so many fundamental questions about the world and so few definitive answers.

To fill the gaps, ancient peoples made up stories that were speculative but plausible, given the best-available contemporary understanding of science. Or to put it another way, every ancient culture on Earth independently developed the genre of science fiction.

These early sci-fi stories were told them around the communal fires and passed them down across the generations. They inspired the process of imagination, speculation, and experimentation that helped advance civilization forward to modern times.

Those stories presaged and created the modern world. So let’s look at those questions again, this time with all the collected knowledge of the Internet Age.

Question: How old is the world?

We now know that modern humans have been around for 200,000 years on a planet that’s 4.5 billion years old in a universe that’s 13.8 billion years removed from the Big Bang—but what happened before that? One leading scientific theory is that there was an era of cosmic expansion that took place before the Big Bang, but how far back in time does that go? And what, if anything, came before cosmic inflation?

Answer: Nobody knows.

Question: What is the world made of?

We now know that all objects in our world are made of atoms that appear on the periodic table of elements, that those atoms are made of electrons that orbit a nucleus of neutrons and protons, and that those particles are made from quarks and other elementary particles. But can quarks break down even further? Are there additional elementary particles we haven’t found yet? What is the nature of the dark matter that makes up most of the matter in the universe? What is the nature of dark energy that makes up more of the universe’s energy balance than all the dark matter and baryonic matter combined?

Answer: Nobody knows.

Question: How far up does the sky go?

We now know how far Earth’s atmosphere extends and the distances to the moon, sun, planets, and all the stars that we can see. We know that the observable universe extends 46.5 billion light years in every direction. But what lies beyond that? Does it go on forever? Does it wrap back on itself like the screens of an old arcade game? Do all parts of the universe have the same physical constants?

Answer: Nobody knows.

Question: Why do things fall?

Isaac Newton’s theory of gravity explains a lot. Albert Einstein’s theory explains more, including the gravity waves that were only just confirmed in February, 2016. But is there a theory that explains everything we observe about gravity? Is there a particle that carries gravitational energy the way photons carry light? Is there a reason why gravity is so much weaker than the other fundamental forces?

Answer: Nobody knows.

Question: Where did all the animals and plants come from?

We now know about genes encoded in DNA, and that all the species we see evolved over billions of years from the same one-celled ancestor, but where did that first ancestor come from? How does non-life first become life? Were the elements of life seeded from space or did they arise entirely on Earth? How rare or how common is the development of life on other worlds in our galaxy and across the universe? Did life ever exist on Mars, or does it now exist elsewhere in our own solar system?

Answer: Nobody knows.

For all the progress we’ve made, we still can’t definitively answer any of these fundamental questions about the nature of our universe. We still have gaps to fill with stories that we now tell, now in books and new media, but still meant to be passed down across the generations.

Speculative fiction is still needed as much as ever to inspire the process of imagination, speculation, and experimentation that will take us forward to the next level of knowledge.

And that is why I’m still wasting my time with all those spaceships and aliens.

Greg R. Fishbone is the author of the Galaxy Games series of sporty science fiction from Tu Books and Spellbound River Press. This article first appeared on the From the Mixed-Up Files of Middle Grade Authors group blog in June, 2016.