Tag Archives: #copernicus

Is it possible to see the world spin from Earth?

A new exhibit has been unveiled for the world premiere of the Artisans of Florence’s Galileo: Scientist, Astronomer, Visionary exhibition that may be able to answer that question.

Galileo’s revolutionary ideas were well ahead of his time. His astronomical discoveries demonstrated that the Earth revolves around the Sun as it spins on its own axis and his Pendulum Laws led to the first clocks and the birth of experimental science.

Imagine Galileo’s delight if he were able to fast forward a few hundred years to the Paris observatory in 1851 to see a marvelous demonstration by French Physicist Léon Foucault. Foucault was able to demonstrate the Earth’s rotation to astonished crowds by setting an enormous pendulum in motion.

As the Foucault Pendulum swings back and forth it slowly rotates around the room, or at least that’s how it appears to us mere Earthbound mortals! In actual fact, we are not observing the pendulum rotate around the room, we are watching the Earth rotate around the pendulum!

You really have to see it to believe it! But if you aren’t able to make it to beautiful New Zealand for the world premiere of the Galileo exhibition in February 2021 you can watch this great time-lapse demonstration by Environmental Scientist Kurtis Baute.

Galileo’s Icy Moon

Four hundred years ago Galileo made a discovery that fundamentally shaped our understanding of the universe and our place in it. Using his powerful telescope he observed that the planet Jupiter had moons, which he initially thought to be planets.

In March 1610, Galileo published his discoveries of Jupiter’s satellites and other celestial observations in Siderius Nuncius (The Starry Messenger). The scientific proof supported the Copernican heliocentric theory that the Sun is at the centre of the Universe, not the Earth.

NASA’s recently published photos, taken by the Juno Jupiter probe in December 2019, have provided us exciting new insights into the largest moon in the solar system.

According to Alessandro Mura, a Juno co-investigator at the National Institute for Astrophysics in Rome, the mapping of the north polar regions of the icy satellite Ganymede in infrared light has revealed a “phenomenon that we have been able to learn about for the first time with Juno because we are able to see the north pole in its entirety. The data show the ice at and surrounding Ganymede’s north pole has been modified by the precipitation of plasma.”

Image of Ganymede’s Trailing Hemisphere by the NASA Jet Propulsion Laboratory