Planet Gravity vs Hellios

Planet Gravity isn't just about gravity anymore. Select a planet to get a scrolling fact about that planet on the display. This app is a twist on the Newton’s cradle balance balls. The pendulum balls collide just like the real set and you can select other planets to use that planet’s gravity. How does the pendulum swing with different gravity? Even the Sun has gravity - see what it does to the motion of the pendulums (well they'd probably melt but you get the idea.....)

How much time is left before our star swells into a red giant? Solar Countdown turns billions of years of stellar evolution into a story you can explore in minutes. Travel from the Sun’s “right now” to its distant future. Each stop on the timeline pairs gorgeous space visuals with clear, bite-sized explanations - what happens to the Sun, and what it could mean for Earth. What you’ll explore • Interactive timeline from the present day to the red-giant phase • Milestones explained in plain English (main sequence stability, warming Sun, magnetosphere changes, ocean loss, and more) • Big-picture countdown that makes cosmic time feel tangible • Beautiful animations and high-contrast space art that bring each era to life • Science-based estimates with approachable context - great for students, teachers, and space fans Whether you’re prepping a class, feeding a curiosity rabbit hole, or love beautiful space apps, this is a quick, captivating way to see our star’s future.