How to PhD is a blog for students. Doing a PhD can make one feel very alone. It is isolating and often leads to mental health problems.
My goal is to provide community, support, and actionable steps to help students succeed in PhD programs and overcome the challenges of academia. Please feel free to reach out anytime, subscribe, and share your story in the comments. Don't be shy to ask any questions and I'll be sure to respond! Thanks for being here! All the best, Oindree
Why is the sky red at dusk?
Why is the sky red at dusk? Dusk is my favorite time of the day. I took this picture during a bike ride one day.
The sky is blue during a clear, sunny day.
This has to do with how light is scattered off of atoms and molecules in our atmosphere.
Sunlight is made up of different wavelengths (colors) of light.
You can test this by holding a prism up and passing sunlight through it.
You will see the different wavelengths from violet to red.
This is also how we get a rainbow after a rainfall where water droplets in the atmosphere can act as a prism.
Atoms and molecules in the atmosphere scatter light of different wavelengths differently.
The blue wavelength is scattered more than the red.
So a clear, sunny day has a blue sky.
During the sunset, however, we see different colors like orange, pink and red.
Atoms and molecules in the atmosphere are still scattering light but now we have moved further away from the Sun as the Earth rotates.
Some of the blue light gets scattered away and the red and orange light reaches our eyes. This page is nice
Enjoy the sunset (and the sunrise if you are a morning person)!