Murriyang: an astronomy telescope that also hears spacecraft

CSIRO’s 64-metre Parkes radio telescope began operating in 1961. In 2020, local Wiradjuri elders gave it the name Murriyang. It is primarily an astronomy instrument, but its history also includes receiving signals from missions such as Mariner 2 and Voyager 2. This overlap shows how an observing facility can contribute to exploration without becoming a dedicated spacecraft or launch program.

Radio astronomy detects emissions from natural sources, while mission support receives signals deliberately transmitted by spacecraft. Both tasks use radio reception, but they need different observing plans and interpretation. Detecting a source on the sky is not enough to establish what it means. Astronomers and mission teams connect the received signal to a target, time, instrument configuration and appropriate processing method.

Murriyang receives signals from space; it does not transmit commands to spacecraft. This is a useful limit to remember when looking at its large dish. Size tells us something about the collecting surface, but not whether the facility has a transmitter, the required radio band or authorization and procedures for a particular mission. A network can combine specialized receiving sites with other stations that send instructions.

Consider an invented situation in which a receive-only telescope returns excellent telemetry — open definition from a probe. The team then needs to upload a revised sequence. The successful downlink — open definition shows that the receiving path worked; the team must arrange a suitable uplink separately. It would be a category error to treat a stronger received signal as proof that this same telescope can send the instruction back.

A working downlink does not establish an uplink

During Apollo 11, Honeysuckle carried the first-step television and Parkes supplied most of the subsequent moonwalk broadcast. CSIRO describes Parkes’ signal going onward through Sydney for television distribution. The physical radio observation, conversion into usable television and delivery to audiences were distinct parts of a shared accomplishment. A dramatic retelling that assigns every step to one dish loses that structure.

The telescope photograph in this lesson was taken in 2009. It shows the real instrument, but it is not a picture of the 1969 broadcast in progress. Treating a later image as historical site context preserves its educational value without inventing an event. The same care belongs in the science: identify what an observation actually establishes, state the relevant date and follow the information through the system before drawing a broader conclusion.