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According to measurements made by the Wilkinson Microwave Anisotropy Probe (WMAP), the material that is by far the most plentiful in the universe is **dark energy**.
For the second part of your question regarding the types of baryonic matter that are most abundant in the universe, the two correct answers are:
- **hydrogen**
- **helium**
Hydrogen is the most abundant element, followed by helium.