Summary:
- The European Space Agency (ESA) is building a massive space antenna called the Laser Interferometer Space Antenna (LISA) to study the "dark universe" - the mysterious dark matter and dark energy that make up most of the universe.
- LISA will be able to detect gravitational waves, which are ripples in the fabric of space-time caused by the movement of massive objects like black holes and neutron stars.
- By studying these gravitational waves, scientists hope to learn more about the nature of dark matter and dark energy, which are currently not well understood.