[Site] FWPhys v1.3 Cover Image Set

Now the welcome page will play a random slideshow of images. I plan to change them seasonally. This season's theme is solar system with impossible optics (i.e. impractical levels of camera zoom). Earth's Atmosphere and the SunEarth and MoonTitan in front of SaturnEuropa in front of JupiterTriton in front of NeptuneSaturn with Titan's shadowPhobos in … Continue reading [Site] FWPhys v1.3 Cover Image Set

[Little Demos] 01 – Wine Glass Einstein Rings

Originally written for a friend in late 2016. Updated in 2020 to remove some inaccuracies and humble brags. Catpic used under (cat's) permission. Do you know that thanks to some convenient optics, we can demonstrate a "gravitational lens" could be demonstrated in my living room (without myself eating 1024 kg of food)? We will be … Continue reading [Little Demos] 01 – Wine Glass Einstein Rings

[To Scale] That Black Hole Picture

If you like scrolling you might enjoy the previous feature: solar-earth light ray diagram to scale. In the spirit of that, and to answer some general complaints, "Why is the photo so blurry!?"... Here's me attempting to put our first black hole portrait to human scales. Of course, this time it's utterly impossible to put … Continue reading [To Scale] That Black Hole Picture

What Does it (really) Take for an ECLIPSE?

I guess you know the drill by now. Round earth with a moon whizzing around, and the pair occasionally block sunlight from each other.  Neat stuff. Do you want to see an actual ray diagram of that? Yes! Well, I drew one in Adobe Illustrator, and then converted it to html. Edit: WP Does not … Continue reading What Does it (really) Take for an ECLIPSE?

What is the Most Frightening Celestial Object?

A few days back on Zhihu.com at home, there was an astronomy question that made it onto the "Trending Q&A" list (quite impressive for my homeland), "What is the most frightening celestial object known to science?" Not surprisingly, in the scientifically literate answers -- many of which I might be interested in covering in the … Continue reading What is the Most Frightening Celestial Object?

Naming the Stars

Another very short one.  I just printed out my last assignment of the week, and decided to spend another few minutes writing (personally) before I head for a Café (to grab a non-caffeinated drink alone, of course), and hopefully finish the problem set soon after. Bay Area's temperature broke historical records this weekend (39 degrees … Continue reading Naming the Stars