January 1, 2018
A day on the planet Mercury is twice as long as its year.
Mercury rotates very slowly but orbits the Sun at 180,000 km/h
Mercury orbits the Sun in slightly less than 88 days
Its interesting to compare:
The Earth orbits the Sun in 365 days at an average speed of 107,220 km/h
The fastest known Neutron star rotates over 700 t...
The morning dance of the planets
April 1, 2020
In this month: April
March 31, 2020
Did you know? Meteor showers...
March 27, 2020
Did you know? Gamma Rays & Gamma Ray Bursts.
March 8, 2020
In this month: March
March 1, 2020
Did You Know? Jupiter's Great Red Spot
February 7, 2020
Professor Dick Hunstead, a friend of Sydney Observatory
Solar Observations: January 2020
February 5, 2020
In this month: February
February 3, 2020
Astronomical connections: Dalrymple, Halley and Cook
January 18, 2020