%0 Journal Article %T Signal Travel Time Anomaly between Earth and Solar Planets %A Fai£¿al Ramdani %J Journal of High Energy Physics, Gravitation and Cosmology %P 1472-1476 %@ 2380-4335 %D 2021 %I Scientific Research Publishing %R 10.4236/jhepgc.2021.74089 %X Travel time anomaly in the communicatin of spatial instruments installed in solar planets and Earth are investigated in a model of gravity impact on radio signal propagation. Resulting travel times anomaly shows variations less than 10-3 seconds to and from Venus and Mars while Sun provides anomaly travel times of about -2 ¡Á 10-2 sec as backward signal needs more times than emitted signal from Earth. In the current explorations on Mars, the travel time anomaly may reach 1.8 ¡Á 10-4 sec as orbital Mars position pass through its minimum distance with respect to Earth. Implications of the difference between one and two-way travel times may be related to redshift/blueshift while travel time of received signal is less or greater than emitted signal. %K Radio Signal %K Travel Times %K Gravity %K Solar Planets %K Redshift %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=112611