业余天文爱好者David Schneider利用廉价材料自制射电望远镜，通过测量星际中性氢云的辐射特征，检测到暗物质在银河系中存在的证据1。他采用的装置成本低廉，仅用25美元的金属屋顶闪烁和45美元的Nooelec SAWBird+ H1低噪声放大器构建天线1，在自家后院即可进行观测1。
Schneider的实验通过测定不同距离处的轨道速度来进行1。他聚焦于中性氢云的1420.4兆赫兹无线电辐射1，利用正切点法通过三角测量将多普勒频移转换为轨道速度数据1。在银河经度0至90度范围内的测量结果显示，轨道速度未随着距离银河系中心的增加而下降1，这与天文学界最近发表的论文结果相符1。
Amateur astronomer David Schneider has constructed a homemade radio telescope to observe evidence of dark matter in the Milky Way using readily available components and backyard observations 1. The setup employs a $25 metal roof flashing cone as an antenna paired with a $45 Nooelec SAWBird+ H1 low-noise amplifier, designed to detect neutral hydrogen radiation at 1,420.4 megahertz 1. By measuring the Doppler shift of this interstellar hydrogen emission across galactic longitudes from 0 to 90 degrees, Schneider used triangulation and the tangent point method to convert frequency shifts into orbital velocity measurements 1.
The resulting data reveal a crucial signature of dark matter: orbital velocities do not decrease with increasing distance from the galactic center, a pattern that aligns with recent findings published in astronomical literature 1. Schneider's approach demonstrates that detecting evidence of dark matter's gravitational effects does not require professional-grade equipment or observatory access, making fundamental astrophysical measurements accessible to citizen scientists conducting observations from their own properties 1.
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