Skywatching
When is the moon full?
If you have never watched the full moon rising above the hills on the other side of a lake, you really need to do something about that. It is beautiful and...
Saturn is the moon king
Researchers using the Subaru Telescope in Hawaii have found 20 more moons orbiting Saturn. This brings the total orbiting the planet to 82, overtaking Jupiter,...
Black holes shred stars
The term "tidal disruption event" or TDE must be one of the biggest cosmic euphemisms around. This is what we say is happening when a star is being...
Visitors from beyond
Every year, we can count on a comet or two visiting our neighbourhood in the solar system. For a few weeks these objects can be the most spectacular objects in...
A warm, wet world
Bizarre exoplanets — planets orbiting other stars — are interesting in that they help us understand how planetary systems form and how they work....
A world of extremes
Hal Clement, a well-known science fiction writer, had a very particular story theme. He imagined bizarre worlds with extreme conditions, such as gravitational...
Heating up the Earth
If, on a clear, sunny day you hold up a one-metre-square, flat piece of black cardboard to the sun, the cardboard will rapidly become very hot. That is because...
Mission to Europa
When the Voyager spacecraft sent back the first close-up images of Jupiter's moon Europa, we all had a shock. It looked nothing like what we expected. Until...
Flashes from the sky
Fast radio bursts, or FRBs, are among the most puzzling things in modern astronomy. From some place in the sky, there is a sudden flash of radio emission,...
Search for aliens
On page 190 of the Observer's Book of Astronomy, published in 1962, author Patrick Moore wrote about Mars: "The planet cannot be regarded as...
Star light, stars very bright
During clear evenings at this time of year, almost overhead you'll see the bright, bluish star Vega. Now, scan westward to find the bright, orange star...
Earth having meteor shower
We are about to pass through a stream of meteoric material once again. Most of it is made up of dust and sand grain sized particles of rock or ice, but there...
Dark matter is everywhere
An unfortunate thing about science is that important discoveries take a long time to hatch. They can be utterly ignored for decades, until a new discovery makes...
Footprints on the moon
Fifty years ago, in July, 1969, people all over the world were glued to their televisions or radios, monitoring the progress of mankind's first manned...
Spinning in space
Long sojourns by astronauts on the International Space Station have shown us that people can recover from extended periods of being weightless under free fall....
Jupiter rising
For the last couple of months Jupiter has been the most spectacular object in the sky after the sun and moon. The giant planet lies in the south-east after...
Free falling in space
We often hear people explaining that "Things float around in space because there is no gravity.” This is not true. Gravity extends across the whole...
Exploding stars tell a story
Understanding the expansion of the universe depends on our ability to measure the distances of very far-off galaxies. Most of these are so remote even our...
Another near miss
This autumn, we will have a close encounter with asteroid 2006 QV89. At its closest, it is estimated to be about 6.7 million kilometres away (around 17 times...
Our debt to starlight
Everything we have ever seen, we have seen by starlight. During the day, our surroundings are lit by the sun, a yellow dwarf star. On a clear night, we can see...