The binary pulsar PSR J0737-3039 was first spotted by astronomers in 2003 in radio wavelengths. X-rays can be used to probe deeper and study the system more thoroughly.

• 牛顿首次探测到来自两颗星都是脉冲星的双星系统的X射线，揭开了一座科学金矿。这个紧密系统的每一颗星都是致密的中子星，自旋非常快，辐射着X射线脉冲。