In recent years, however, physicists have begun to speculate that gravity might travel in waves made of particles called gravitons...
पुढे या पुस्तकात म्हटले आहे की “गुरुत्वाकर्षणाची शक्‍ती कोणतेही दृश्‍य माध्यम नसताना मोकळ्या जागेतून तत्काल प्रवास करते.