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Lena Synnerholm's blog.
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On the Cretaceous–Paleogene mass-extinction
2024-09-02 12:16
The world looked a bit differently 66 million years ago. Pangaea had splintered into Africa, Antarctica, Australia, Eurasia, North America and South America. Antarctica was connected to Australia, and Eurasia to North America.
Life before the dinosaurs
2024-08-07 16:56
Many imagine the early Earth as covered in molten rock. Fact is the Earth’s crust solidified within a hundred million year after the birth of the Moon. 200 million years later the Earth was almost completely covered by seas.
Has the world ever frozen over?
2024-06-05 13:16
There is a hypothesis that the Earth at one or several points would have been entirely covered by ice. This is called Snowball Earth and is a controversial idea. All the suggested points have their own problems.
Icehouse Earth and ice ages
2024-05-31 13:02
The climate during the last 550 million years is rather well-documented. There have been several periods of tens of millions of years without any ice sheets. The greenhouse effect was then considerably stronger than it is today.
What global warming means
2024-05-22 13:19
Climate change means a shifting in statistical averages. In the case of global warming this means a shift to the warmer. Mostly this affects areas situated closer to the poles.
Climate and seasons
2024-05-17 12:46
Climate is the average weather pattern for a place or an area. Usually, it is the average for a period of 30 years. Far too many mistake this for how the weather is for the moment.
On the movements of the Sun
2024-05-02 12:57
There are people taking it for granted they already know how the Sun moves. The trouble with this is what they think they know is false.
On the movements of the Moon
2024-04-26 12:33
A great deal of people seem to believe the Moon is only up at night. I think it is because the crescent is used as a symbol for night-time. Neither do they spend much attention at what one can see in the sky.
Distances in space
2024-04-24 12:31
It can be hard to grasp exactly how empty space is. The astronomer David Morrison once got the question:
The myth of the arbitrary movements of the heavenly bodies
2024-04-18 12:49
Many seem to lack basic knowledge on the movements of the heavenly bodies. This applies to things like the following:
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