How Fast does the Earth Move Through Space?

Speed is relative. We know how far the Earth is from the Sun, and we know that it takes one year to make a complete circuit. We also know that speed equals distance divided by time, so by dividing the calculated circumference (in kilometers) by the number of hours in a year, we get our […]

This is the biggest known star in the Universe

UY Scuti is a red hypergiant and pulsating star in the constellation Scutum. It is currently the largest known star. First cataloged in 1860 by German astronomers, the star has an estimated radius of 1,708 solar radii (1.188×109 kilometres; 7.94 astronomical units); thus a volume nearly 5 billion times that of our Sun. A hypothetical object travelling […]