The naturally occurring signal was captured during flight from the planet by the Parker Solar Probe, which took the first direct measurement of Venus’ atmosphere in nearly 30 years.
NASA says the spacecraft passed during the flight just 517 miles above the planet’s rocky surface, where it picked up the radio signal.
“I’ve been very excited to get new data from Venus,” said Glenn Collinson, an astronomer at NASA’s Goddard Space Flight Center.
NASA says the flyby did indeed take place last July, but they are only now releasing their analysis of the data.
It was the first time that new measurements had been taken of Venus since 1992.
Experts say the planet’s upper atmosphere was thinner in size last year than the previous time it was measured.
NASA has now published a study confirming that the planet’s upper atmosphere undergoes “baffling changes” during an 11-year solar cycle.
Scientists say that Venus is like Earth, Has an electrically charged gas layer at the upper edge of its atmosphere called the ionosphere, which naturally emits radio waves that can be detected by devices.
Venus and Earth are twin planets, both of which are rocky and similar in size and structure.
But unlike planet Earth, Venus has a toxic atmosphere and unprecedented surface temperatures of 864 degrees Fahrenheit or 462 degrees Celsius.
This was the third flight of the solar probe from Venus, as each flight around it was designed to fly close to the sun.