Space tugs have been a topic of research for quite a while in the space community. A number of companies targeting the in-space space transport market over the last few years, e.g., [1][2]. There's also a recent YC alum targeting this [3].

Propulsion is itself a really hot topic in the NewSpace market the moment, ranging from tiny thrusters for precision attitude control of smallsats, to large systems for orbital transport. We recently published a review of smallsat thrusters, highlighting the rich spectrum of solutions being brought to market [4] (Disclaimer: I'm one of the co-founders at satsearch).

There's a lot of systems innovation that enabling fuel-efficient solutions to be developed. Particularly, there's a lot of progress being made on developing high-efficient electric propulsion. One of the trending areas is water-based propulsion, given that it's clean, non-toxic, storable, and also abundantly available in the Solar System [5].

With companies also look at building fuel depots to refuel spacecraft on orbit [6], there's a wide array of new solutions that are going to emerge for repeat use of tugs.

The traditional GEO market went through a massive dip last year [7], but there's renewed interest with the real prospect of small GEO missions materializing in the next 24 months. Another YC alum is targeting this market [8].

So in short, this is a really dynamic sector, going through a lot of changes at the moment. I'm eager to learn more about Epic, to see where they're carving a niche for themselves. Also, interesting to see YC's continuity in funding hardtech space startups.

[1] https://spacenews.com/airbus-to-challenge-ssl-orbital-atk-wi...

[2] https://www.atomosspace.com/

[3] https://momentus.space/rides/

[4] https://blog.satsearch.co/2019-07-10-cubesat-thrusters-an-ov...

[5] https://www.thespaceresource.com/news/2019/2/propelling-dema...

[6] https://www.orbitfab.space/

[7] https://spacenews.com/amid-geo-downturn-launch-operators-loo...

[8] https://www.astranis.com/