Original sentence: At the termination shock, the solar wind slows abruptly from its average speed of 300 to 700 km per second (700,000–1,500,000 miles per hour) and becomes denser and hotter.In May 2005, Voyager 1 was 14 billion km from the Sun and traveling at a speed of 3.5 AU per year (approximately 61,000 km/h, or 38,000 mph) while Voyager 2 is about 10.5 billion km away and moving at about 3.13 AU per year (approximately 53,000 km/h, or 33,000 mph)
Edited sentence: At the termination shock, the solar wind slows abruptly from its average speed of 300 to 700 km per second (700,000–1,500,000 miles per hour) and becomes denser and hotter.In May 2005, Voyager 1 was 14 billion km from the Sun and traveling at a speed of 3.5 AU per year (approximately 61,000 km/h, or 38,000 mph) while Voyager 2 is about 10.5 billion km away and moving at about 3.13 AU per year (approximately 53,000 km/h, or 33,000 mph)