On Thursday, 20th January 2022, Dan was joined by Greg Brown.
He’s an astronomer from the Royal Observatory Greenwich.
He spoke all about what life might be like on other Earth-like planets.
It’s all to do with our record-breaking, history-making radio programme, Mission Transmission, where we sent your voices to the stars.
Greg revealed how long it might take for our Mission Transmission message to reach them and, if there is life on those planets, how long it might take them to reply!
On the 21st February 2022 we sent YOUR voices to space as part of Mission Transmission.
You can listen to Mission Transmission – our radio broadcast to deep space featuring YOUR voices here.