On any given day, NASA's networks may communicate with more than 100 space missions. Whether the mission keeps the lines of communication open with orbiting astronauts or peers deep into the cosmos, those dozens of satellites all have one thing in common: each needs an antenna. Without one, NASA missions and their discoveries simply would not be possible.

To ensure those antennas are up to the challenges of spaceflight, for most that means rigorous testing on the ground in a simulated space environment. The Goddard ElectroMagnetic Anechoic Chamber (GEMAC) at NASA's Goddard Space Flight Center in Greenbelt, Maryland, has been an integral antenna proving ground for more than 50 years.

In about one year from now, the European Space Agency will launch its Hera mission. Its destination is the asteroid Didymos, and it'll be the second human spacecraft to visit the 390-meter chunk of rock. NASA's DART mission crashed a kinetic impactor into Didymos' tiny moonlet Dimorphos as a test of planetary defense.

Hera will perform a follow-up investigation of the binary asteroid to measure the size and morphology of the impact crater on Dimorphos. To help it along, it's taking two tiny CubeSats that will land on Dimorphos.

It might seem strange that two tiny satellites will perform landings on an asteroid. But Hera is designed to fulfill different goals. First of all, it's part of the ESA's Planetary Defense program.