What microgravity facilities does ZARM offer?

ZARM at the University of Bremen operates two complementary microgravity facilities: the Drop Tower Bremen, which provides 9.3 seconds of weightlessness — described by ZARM as longer than any other earthbound test facility worldwide — and the GraviTower, which supports roughly 20 microgravity experiments per hour and also allows research under partial gravity such as that found on the Moon or Mars. Both are used for scientific experiments under microgravity conditions, and the choice between them depends on whether you need the longest possible continuous free-fall time or a high experiment repetition rate with variable gravity levels.

Drop Tower Bremen: longest free fall on Earth

The Drop Tower is ZARM's flagship laboratory. Its defining capability is the duration of weightlessness it produces: 9.3 seconds, which ZARM states is more than any other ground-based test facility in the world.

That matters because many microgravity phenomena — fluid behavior, combustion, material solidification, biological processes — need enough uninterrupted free-fall time to develop and be observed. A longer drop means more usable data per experiment and access to slower physical processes that shorter facilities cannot resolve.

The trade-off is throughput. A drop tower releases one capsule per drop, so experiments are typically run one at a time with a recovery and reset cycle in between, rather than in rapid succession.

GraviTower: high repetition and partial gravity

The GraviTower addresses the opposite need. According to ZARM, it allows about 20 microgravity experiments per hour, making it suited to studies that benefit from many repeated runs, parameter sweeps, or statistical sampling rather than one long observation.

It also adds a capability the Drop Tower does not offer: research under partial gravity, as found on the Moon or Mars. That makes it relevant for researchers studying how reduced-but-nonzero gravity affects a system — a condition directly tied to lunar and Martian surface operations.

Choosing between them

If your experiment needs the maximum single stretch of weightlessness available on Earth, the Drop Tower is the relevant facility. If you need many runs in quick succession, or you want to vary gravity between microgravity and lunar/Martian levels, the GraviTower fits better.

What the facilities are used for

ZARM describes itself as conducting research for space and under space conditions, with the position that fundamental research must pave the way before anything reaches everyday use. Its stated areas of expertise are:

• Quantum and gravitational physics
• Fluid dynamics
• Space exploration
• Experiments under microgravity conditions

The facilities serve these areas as test environments — for example, a fluid dynamics group studying how bubbles break up in turbulence would use a microgravity facility to remove buoyancy effects that dominate on the ground.

Practical notes for prospective users

• Access model: The source does not state pricing, booking terms, or whether use is free or paid. Treat cost and scheduling as things to confirm directly with ZARM rather than assuming.
• Discipline fit: ZARM's teams span all STEM disciplines — engineers, physicists, mathematicians, and IT specialists — and the institute states it works with international collaborators, so proposals are not limited to one field.
• Starting point: ZARM publishes news and scientific talks on its site, which is a reasonable way to see current experiment topics and identify who to contact.

For current specifications, availability, and application procedures, check ZARM's own pages, since the details above reflect what the institute states about the two facilities rather than a full operational handbook.