Space 01
Why No Stars in Moon Landing Photos? The Exposure Math
Why are there no stars in Moon landing photos? We run the exposure numbers for the Apollo Hasselblads and show which photos do catch Venus and stars.
Space
Space 02
Why Are Auroras Different Colors? Green, Red and Purple
Green and red auroras come from the same oxygen atom. A 0.75 s vs 134 s lifetime and air density decide which colour wins. The physics, with worked numbers.
Space 03
Why Is the Moon Red During a Lunar Eclipse? The Real Physics
Earth's air bends sunlight 1.1° into its shadow and strips the blue on the way. A worked model of the red Moon, the blue rim and why volcanoes darken it.
Space 04
Is There Gravity on the ISS? Yes: 89% of Earth's
Gravity at the ISS is 89% of Earth's surface value. Astronauts float because they fall 4.35 m every second and keep missing. Here are the numbers.
Space 05
How Cold Is Space? 2.7 K, 120 °C and Everything Between
Deep space glows at 2.7 K, yet a sunlit plate near Earth hits 120 °C and ISS-height gas tops 700 K. What "the temperature of space" really means.
Space 06
Could a Mars Dust Storm Knock Over a Rocket? The Physics
A 100 km/h Martian storm pushes like a 12 km/h breeze on Earth. We run the tipping math for a 50 m rocket and find what Mars dust really threatens.