  The New Space Era has increased communication traffic in space by new space
missions led by public space agencies and private companies. Mars colonization
is also targeted by crewed missions in the near future. Due to increasing space
traffic near Earth and Mars, the bandwidth is getting congested. Moreover, the
downlink performance of the current missions is not satisfactory in terms of
delay and data rate. Therefore, to meet the increasing demand in space links,
Terahertz band (0.1-10 THz) wireless communications are proposed in this study.
In line with this, we discuss the major challenges that the realization of THz
band space links pose and possible solutions. Moreover, we simulate Mars-space
THz links for the case of a clear Mars atmosphere, and a heavy dust storm to
show that even in the worst conditions, a large bandwidth is available for Mars
communication traffic.
