He argues that radar astronomy, which is used to probe things like asteroids and the surface of Venus, already gives off signals that could be picked up by aliens.
他认为，人类运用雷达天文学探测小行星和金星等天体，早已经发射出可以被外星智慧生物接收到的信号。
From June to October 1975, Russian space probe Venera 9 became the first craft to orbit, land on, and photograph Venus.
1975年6月- 10月，俄罗斯金星9号探测器第一个绕金星轨道运行，着陆，拍摄的航天器。
The Venus Express probe discovered hydroxyl in the clouds that shroud the planet.
金星快车探测器在金星高空发现了羟基，并且覆盖着星球。
Two spacecraft are being launched to probe deeply into the atmosphere of Venus.
将发射两个航天器来深入探测金星的大气层。
A Japanese probe sent on a two-year mission to Venus failed to enter orbit and may have flown passed the planet, BBC reports.
据英国广播公司消息，日本发射的一颗执行为期两年探测任务的金星探测器，未能入轨，目前可能已经飞越了金星轨道。
1961 - Venera program: Venera 1 becomes the first man-made object to fly-by another planet by passing Venus (the probe had lost contact with Earth a month earlier and did not send back data).
1961年的今天，维尼拉计划：维尼拉1号太空揣测船在经过金星后，成为首架人造的、能飞往其他星球的物体。
1961 - Venera program: Venera 1 becomes the first man-made object to fly-by another planet by passing Venus (the probe had lost contact with Earth a month earlier and did not send back data).
1961年的今天，维尼拉计划：维尼拉1号太空揣测船在经过金星后，成为首架人造的、能飞往其他星球的物体。
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