Here's how much it actually costs to launch things on a SpaceX rocket

Mice are pretty light, weighing in at about 3/4 of a pound each. That's between $6,825 and $20,250 per mouse!

But, of course, you can't send a single mouse up there, she'll get lonely. Add in 69 friends and you'll looking at a travel bill of about $470,925 to $1.4 million.

Of course, we're kidding. The mice are definitely not up there to keep each other company. They're there for research. They're there to study the biological effects of space, including muscle atrophy. And that has important implications for medicine down here on Earth, including learning more about disease and aging.

Plus a ton of other instruments, including harmonicas, guitars, and at least one saxophone.

The weight of the bagpipes is can be highly variable depending on materials and design. As far as we can tell, it seems that astronaut Kjell Lindgren, shown here, is a pretty serious piper, and strong enough to support a full-sized set of bagpipes.

Let's say he was weight-conscious and went with a relatively light set-up — so 6 pounds, or 2 pounds less than your average 8-pound bagpipe.

That's in the ballpark of $54,600 to $162,000, but it means a lot to astronauts who are far from home and miss life on Earth. Also, the YouTube video of Lindgren playing in space is so worth it.

Once upon a time, astronauts were relegated to free-dried coffee, which they rehydrated at far-less-than-boiling-hot temperatures. The coffee was so terrible, it used to be a common complaint among astronauts.

No more! In 2015, the ISSpresso arrived on board the space station, and space java has never been the same since.

The espresso machine was created in possibly the most Italian collaboration ever: Software firm Argotec and coffee producer Lavazza, both based in Turin, and the Italian space agency.

The machine is hefty, though. At 44 pounds, it cost between $400,400 and $1.2 million to deliver the ISSpresso.

In 2015, astronauts aboard ISS got a very special treat: Real leafy greens, grown locally — in space.

The experiment was about more than salad. Astronauts are studying the effects of microgravity on plants. If we're going to ever send humans to Mars, understanding how to grow veggies is going to be very, very important.

At 16 pounds, it's $145,600 to $432,000, which is just slightly more expensive than a salad in Manhattan.

The internet went wild for this video of astronaut Scott Kelly in a gorilla suit aboard ISS. After all, what's better than zero-gravity absurdity?

Each astronaut is allotted cargo on resupply missions. It's important to get mementos from home — after all, you're missing every milestone and holiday for the duration of your stay on ISS.

Margasahayam said that families will often send cards, gifts, and occasionally even cakes for birthdays and holidays. Scott's twin and fellow astronaut, Mike Kelly, instead sent him the suit.

This gorilla suit on Amazon weighs 4.3 pounds. We assume there's not a lot of variation in gorilla-suit weight, so we're going to put that price tag somewhere between $116,000 to $391,000.

Astronaut Scott Kelly spent a year in space to study the sometimes torturous effects on his body.

That's a long time to spend indoors, so at one point NASA sent up a bunch of fresh lemons to mix things up. (Kelly juggled them in a video about the science of metabolism in space.)

Since the average lemon weighs about 3.5 ounces, that's $2,000 to $5,900 per piece of fruit.

Nope, not calamari, though some astronauts would probably appreciate that, too. Actual, live, wriggly squids.

It's another research project, of course: The astronauts are using the squid to study the relationship between animals and beneficial bacteria.

(Bobtail squid have an arrangement with a certain bacteria. The bacteria lives in the squid, and the squid uses the bacteria to make light underwater.)

Baby bobtail squid are really, really light, weighing less than a hundredth of an ounce. Not counting the test tubes, each squid cost $1.60 to $4.80 to send up into space.

Okay, so you didn't actually pay for this one, but it's so perfect we had to include it.

The ashes of Roddenberry, his wife, Majel Barrett Roddenberry (aka Lwaxana Troi), and James Doonhan, the original Scotty, all went to space as a secondary payload on a 2012 SpaceX resupply mission. SpaceX partnered with private company Celestis, which specializes on sending ashes into space.

Also included were the ashes of famed science fiction author Arthur C. Clarke.

The ashes never made it all the way to the space station, either. The capsule was jettisoned about 10 minutes into the flight, and is still orbiting Earth.

If that sounds like the ideal funeral, be prepared to shell out: Sending just one gram, or a third of an ounce, of ashes into orbit runs $2,995. If you want to posthumously travel to deeper space, you or your next-of-kin are looking at $12,500.

By Earth standards, sure. But Margasahaym says it's worth it.

Experiments conducted on the space station have huge potential to teach us about the human body and the future of space flight. Space programs like NASA have led to huge leaves in technology that we use every day here on Earth.

"NASA is the pinnacle of American ingenuity and engineering," Margasahayam said. He also points out that NASA's budget is really very small compared to other departments.

As we've written before, too, entrepreneur Elon Musk (who owns SpaceX) hopes to bring the cost of shipping objects to space to less than $1,000 per pound.

In the end, shipping stuff to the ISS is crazy expensive. But it also represents international collaboration, scientific advancement, and innovation — and that's priceless.