NASA Successfully Tests Revolutionary Rocket That Could Get Us to Mars Faster
Hypx@kbin.social to 
sciencealert.com
After setting foot on the Moon, the next destination for humankind is Mars, which presents a whole new set of challenges in speedy, long-distance space travel.
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The international standard is km/h.
Why not using SI units and m/s?
km/h is an SI unit.
I'm sorry to be a stickler, but it's not an SI unit.
Have a look at p. 145 and "Non-SI units that are accepted for use with the SI", if you want to know more: https://www.bipm.org/documents/20126/41483022/SI-Brochure-9.pdf/fcf090b2-04e6-88cc-1149-c3e029ad8232?version=1.22