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2GEDA0C BRNO, Czech Republic - August, 14. 2020 Giant inflatable model of the planets Mars, Earth and Moon at night with silhouettes of people. Solar system

Why are there no moons with natural satellites of their own?

The planet a moon orbits exerts a stronger gravitational influence than the moon itself, explain our readers

What would happen if the speed of light were half its value? part 2

D73X1R An colorful adult midnight snapper swims over the reef

This week鈥檚 new questions

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The bigger the lizard, the bigger the Wiki page, discovers ecologist

Life

Dramatic photo of ibis being guided to their winter homes wins award

PF9N2P Honeybee stick on a window

This week鈥檚 new questions

Tom Gauld’s pie chart of what the Mars rover can see

E7MK5Y Insectivorous plant Venus fly trap (Dionaea muscipula) digesting a captured mosquito. Plant house, Galveston, Texas, USA.

Why don鈥檛 carnivorous plants just use photosynthesis? part 2

Twisteddoodles on an endangered species breeding programme

Aerial view of an oasis on the edge of the desert town of Mao, known as the 'White City' for the limestone used to build local homes. For centuries, oases have enabled humans to survive, and even to thrive, in some of the harshest environments on earth. Now they are under threat from climate change.

Environment

Striking photos show how sands are encroaching on oases in the Sahara

A photo essay from Tommy Trenchard explores efforts to protect the fragile ecosystems of oases in Chad

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Think you have a good sense of humour? So do most people鈥�

When the sun engulfs Earth, will the remnants become new planets?

Tom Gauld on the worst place to sit

Mathematics

Explore the mind-bending and paradoxical art of M C. Escher