#UltimaThule, 4B miles away, Jan 1.

Farther away —> weaker radio signal. You need big ground antennas to receive the signal, measured in attowatts. 10^-18 W!

Our BIG @NASA #DSN 70-m dishes to the rescue! Check out the scale.@NASANewHorizons @JHUAPL @AlanStern @exploreplanets pic.twitter.com/xCfYYFQiyG

— Dipak Srinivasan (@DipakSrinivasan) December 28, 2018