NASA delays first flight of Mars helicopter

During Martian daytime, the planet’s surface receives only about half the amount of solar energy that reaches Earth during its daytime, and nighttime temperatures can drop as low as minus 90 degrees Celsius, which can freeze and crack unprotected electrical components.During Martian daytime, the planet’s surface receives only about half the amount of solar energy that reaches Earth during its daytime, and nighttime temperatures can drop as low as minus 90 degrees Celsius, which can freeze and crack unprotected electrical components.