EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Hacker News·Jul 31·5 min read
Detect Dark Matter's Mark from Your Backyard
TL;DR
A homemade pyramidal-horn antenna was built to detect dark matter's presence using radio emissions from interstellar hydrogen clouds, potentially advancing our understanding of this elusive material.
✦ Why It Matters
Consider building your own radio telescope to explore dark matter detection from your backyard.
Key Takeaways
- Build a radio telescope using affordable materials like roof flashing and a paint can.
- Measure hydrogen emissions to analyze the presence of dark matter.
- Use Doppler effect to determine the speed of interstellar clouds.
- Validate findings against existing astronomical data for accuracy.
How It Works
The homemade radio telescope detects emissions from hydrogen clouds, allowing measurement of their Doppler shifts. By analyzing these shifts, the speed of clouds orbiting the Milky Way can be calculated, revealing whether their velocities decrease with distance from the galactic center.
This method leverages the tangent-point technique to estimate distances and speeds, providing insights into the distribution of dark matter.