by Tony Alegria Although we are circling the Sun at some 108 000 kilometres per hour (kph) giving us our years and rotating at 1 800 kph to give us our days, we have no sensation of speed. In fact, it feels like we are standing still and everything in the sky is moving from […]
The Celestial Sphere and Planets Read More »
By Tony Alegria The average distance from Earth to our Sun is about 150 million kilometres and that distance is called an Astronomical Unit (AU). This is the unit used for measuring distances within the Solar System e.g. Jupiter is 5.2 AUs from the Sun. A near-Earth object (NEO) is any small Solar System body
by Tony Alegria Last year we had this news from The Guardian: “A house-size asteroid will give Earth a near-miss on Thursday 12th October 2017, giving experts a rare chance to rehearse for a real-life strike threat as it passes inside the moon’s orbit. Dubbed 2012 TC4, the space rock will shave past at an
