EROS (Experiments for Observing Dark Subhalos)

EROS (Experiments for Observing Dark Subhalos) is a scientific effort to detect small, invisible dark matter structures within larger cosmic formations. These subhalos—clumps of dark matter—don’t emit light, making them difficult to observe directly. EROS aims to identify their presence by monitoring the light from distant stars, looking for subtle gravitational effects like microlensing, where a dark subhalo temporarily magnifies a background star’s brightness. Detecting these subhalos helps scientists understand dark matter’s distribution and properties, offering insights into the fundamental composition of the universe.