July 17
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1850 – Vega becomes the first star (other than our own Sun) to be photographed.
1975 – Apollo–Soyuz Test Project: The American Apollo and Soviet Soyuz spacecraft dock with each other while in orbit, marking the first such link-up between spacecraft from the two nations.
2018 – Astronomer Scott S. Sheppard announces that his team have discovered a dozen irregular moons of Jupiter.
