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B1PP5G Spiral Galaxy M74 i. Image shot 2008. Exact date unknown.

What makes galaxies spin in a certain direction?

Galaxies do not all spin in the same direction, say our readers - after all, they have no way of telling clockwise from anti-clockwise

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Various disco, soul and funk, seven inch records at second hand store.

Why can鈥檛 we conjure up smell and touch in our heads? Part 3

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Yellow wash scrub sponge placed on wet blue background covered with drops of water in light room during household chores; Shutterstock ID 2167323189; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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Motion Speed Light in London City; Shutterstock ID 1093994570; purchase_order: -; job: -; client: -; other: -

Is the speed of light in high gravity different from in low gravity?

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2REAK4A world map of african countries and arabian sea, madagascar island and zambia in close up focus

Why is the east coast of Madagascar so straight?

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BNYGBG Astronaut Ed White the First American to Conduct a Spacewalk on Gemini 4 Mission June 3rd 1965 - Manuevering gun in his Right hand and Tether Cable

This week鈥檚 new questions

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Middle-aged woman in glasses fell asleep while reading book at home, female sleeping with open mouth on sofa near coffee table with houseplant in living room. Sleep deprivation; Shutterstock ID 2122133960; purchase_order: -; job: -; client: -; other: -

Are we conscious when we are asleep?

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The surface of Venus, the irregularities of the planet. Elements of this image furnished by NASA. High quality photo; Shutterstock ID 2157724597; purchase_order: -; job: -; client: -; other: -

Could we build a habitable dome on the surface of Venus? (continued)

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Two seagulls above aircraft wing

This week鈥檚 new questions

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The Supermoon rises over houses in Olvera, in the southern Spanish province of Cadiz, July 12, 2014. Occurring when a full moon or new moon coincides with the closest approach the moon makes to the Earth, the Supermoon results in a larger-than-usual appearance of the lunar disk. REUTERS/Jon Nazca (SPAIN - Tags: SOCIETY CITYSCAPE TPX IMAGES OF THE DAY) - GM1EA7D0FC401

When was it first realised that moonlight must be reflected sunlight?

Anaxagoras, who was born around 500 BCE, was one of the first to realise that the lit portion of the moon always faces the sun, although it was hinted at a little earlier by Parmenides, say our readers

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Would a northern hemisphere 鈥渋ce age鈥� trigger one in the south too?

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How do dogs recognise that another animal is also a dog? (continued)

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This week鈥檚 new questions

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What would happen to a galaxy if the black hole at its centre left?

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