How was the size of Earth first measured?
Earth’s circumference was first accurately measured more than 2,000 years ago by the Greek astronomer Eratosthenes, who at the time […]
How fast is Earth moving through space?
To begin with, Earth is rotating on its axis at the familiar rate of one revolution per day. For those
What causes the Northern and Southern Lights?
The famous Northern and Southern Lights — Aurora Borealis and Aurora Australis for those Latin lovers among us — are
Why does the Moon look bigger at the horizon?
The “Moon illusion,” in which the Moon appears larger than normal when close to the horizon, is not the result
Can solar flares and sunspots affect Earth?
While no direct link between sunspots and Earthly events, such as volatile stock markets, has ever been found, extremes in