In 2010, physicists at the US National Institute of Standards and Technology (NIST) placed two atomic clocks on shelves, one 33 centimetres above the other, and measured the difference in their rate of ticking.
markale tijaabadan waa mid la sameeyey, sanadkii 2010 fisikis yahanada Machadka Tiknoolajiyadda ee Mareykanka (NIST) ayaa laba saacadood oo atoomik ah dul saaray istifaalo mid ayaa 33 centi metre ka sareysay tan kale, waxaana la cibray xaddiga garaacistooda, tii hooseysay ayaa garaaceysay si ka hooseysa tan kale- Sababtuna waa cuf-isjiidka dhulka.