space agency DLR (70 percent share) and NASA (30 percent share). The Helios probes, built by the main contractor Messerschmitt-Bölkow-Blohm, were the first space probes built outside the United States and the Soviet Union to leave Earth orbit.

Structure

The two Helios probes look similar. Helios-A has a mass of 370 kg, and Helios-B has a mass of 376.5 kg. Their scientific payloads have a mass of 73.2 kg on Helios-A and 76.5 kg on

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