This was one result from my daughter's 2019 science fair project. (I kind of rubbed off on her for this one.) :-) Her question was with regards to natural objects - Do natural objects transmit radio signals? She started with the sky and objects in the sky.

She used a 1.8 meter dish antenna. Her antenna feed horn that she made using metal cans was tuned to 1.4 GHz. She also made a can for 1.31 GHz and 1.7 GHz. We haven't tested those yet. The frequency selection was actually based on the size cans we could obtain (even 1.4 GHz).

The 'picture' was taken using the 1.8 meter dish antenna pointed at 12 different vertical positions on the sky from 15 degrees to 90 degrees. 1.4 GHz feed horn. Vertical 'scans' across the same southern sky location every 15 minutes. Each position/square encompassed roughly 7 degrees of sky. Frequency was tuned to 1.4205 GHz (hydrogen). We actually found a blip at that frequency when we weren't necessarily looking for it. Up is on the top and down is on the bottom.

Milky Way in the vicinity of Sagittarius is on the far right (we didn't get the entire streak as we started a little late and it was freezing outside). Andromeda Galaxy is in the upper left. Sun was specifically colored yellow in this image (it had the 'brightest' intensity with the exception of the center of the Milky Way that is near the bottom right). We are not 100% sure what the lower left streak is. It may be due to electronics drift of some sort. We did notice that the power levels were always slightly higher the farther down we pointed. Not sure why. More resolution of the colors is needed for this picture to differentiate objects better but it's not too bad. Lighter intensity is stronger signal.

She used a LNA (Low Noise Amplifier) with battery powered +5V regulator at the feed horn followed by 2 standard amplifiers. (We later found out that 3 standard amplifiers provided a more stable result.) Received using Airspy radio at PC. SDR # software used to collect power levels.

The spreadsheet shows signal power levels in dB.

It was a very fun project and will be a good memory.