Science. 1966 Jul 22;153(3734):411-4. doi: 10.1126/science.153.3734.411.
A neutral hydrogen survey of the Andromeda galaxy (M31) has been conducted with the 260-foot (80m) Ohio State University radio telescope. The neutral hydrogen is concentrated in the spiral arm regions, with but relatively small amounts near the center of the galaxy. Similar deficiencies have been found near the center of M33 and our galaxy, suggesting similar evolutionary processes in the three galaxies.
使用 260 英尺（80 米）的俄亥俄州立大学射电望远镜对仙女座星系（M31）进行了中性氢调查。中性氢集中在螺旋臂区域，而在星系中心附近的数量相对较少。在 M33 和我们的星系中心附近也发现了类似的缺陷，表明这三个星系的演化过程相似。
