
32 ISE Magazine | www.iise.org/ISEmagazine
A return to the moon and beyond
Gardens in space: Crop lab
grows produce for astronauts
One area in the Space Station Processing Facility is dedicated
to the growing of crops that can be transported and used in
space for astronauts to grow some of their own fresh food.
Earlier this year, the ISS crew enjoyed “space tacos” seasoned
with their own space-grown chili peppers.
The crop lab includes various types of fruits and vegetables
tested for their viability in space with an eye toward efficient
use of water and space. They are cultivated in environmental
growth chambers designed to simulate conditions found on
the space station.
Among the foods grown in the lab are microgreens, which
astronauts can sprinkle on other foods for a boost of nutrients,
plus various types of peppers, tomatoes and even strawberries.
“A lot of times what we do is mimic ISS conditions to cul-
tivate plants,” said Lashelle Spencer, a plant scientist with the
Laboratory Support Services and Operations contract (LAS-
SO) at NASA. “These plants are grown like 3,000 ppm (parts
per million) CO
2
and we want to evaluate how well they do in
those environments. And they don’t necessarily really always
like it so we use these chambers to simulate that environment.”
The next step is to determine if the plants grown are as safe
for astronauts to eat as those grown in earth soil.
“I think for the most part they really enjoy having fresh,
good, safe produce,” said Mary Hummerick, a LASSO mi-
crobiologist at the lab.
The rocket’s journey from
VAB to pad via the crawler
To get a massive rocket such as the SLS from the cavern-
ous Vehicle Assembly Building (VAB) to the pad requires a
heavy-duty transport vehicle. Enter the crawler-transporter,
a 6.6-million pound behemoth that has carried rockets to the
launch pads since the early 1960s and is the world’s largest
self-propelled land vehicle, according to Guinness. It was up-
graded recently for the task of delivering the Artemis 1 rocket
and spacecraft to Launch Pad 39B in mid-March, a journey
that took roughly 11 hours at less than 1 mile per hour.
Fully loaded with the rocket and mobile launcher support
gantry, the vehicle hauled just shy of 15 million pounds. The
track the crawler travels is covered with a special kind of peb-
Strawberry plants are grown in a controlled environmental
chamber at NASA’s crop laboratory.
“We framed dozens of chili peppers to make
sure that they were compatible with the
environment to which we wanted them to grow.
Did they have good germination? Did they
have the right size? Are they compatible with
LED lights? We did them in these chambers. So
about three years ago, we grew chili peppers, but
right now we’re testing strawberries. So maybe in
three years, we’ll have strawberries.”
— Lashelle Spencer, LASSO plant scientist
“I can tell you that you better be on your game
as far as keeping these (crawler systems) up to
snuff. These have to be in tip top shape. We
want to make sure that our (operation) is kind
of seamless. ... We can’t afford any downtime.
We can’t stop. Before you check something out,
before you take it out, you want to make sure
it’s working properly. Like your vehicle, if you let
it sit for two months, go see what happens to it.
Every two weeks (at a) minimum, we operate
(the vehicle), we move it. Before a launch (haul),
we check all systems. We maneuver, make sure
of our steering, all the systems are activated
and responding correctly. I think that checkout
ahead of time is imperative to verify all of the
subsystems are running perfectly.”
— Stan Shultz, crawler operations engineer and
driver with contractor Jacobs