51动漫

Sound waves spectrum

As sound dissipates, what happens to this energy?

Sound energy turns into heat, say our readers - but the amount is negligible and doesn鈥檛 contribute to global warming

Two seagulls above aircraft wing

Do winged animals ever suffer comparable mishaps to aircraft? Part two

In this Voyager 2 image of Saturn, obtained Aug. 11, 1981, from a range of 14.7 million kilometers (9.1 million miles), north is at the upper right edge of the disc. Seen above the planet are the satellites Dione (right) and Enceladus. This false-color print shows a green spot at the south edge of a yellow band; in true color, the spot would appear brown and the band white. A bright yellow spot slightly above and to the left in this image moves eastward relative to the green spot at a rate that allows it to pass the green feature in about 50 days. The convective clouds that appear between the two spots are typical of the region. Here, the smallest visible structures measure about 270 kilometers (170 miles). The Voyager project is managed for NASA by the Jet Propulsion Laboratory, Pasadena, Calif. https://www.jpl.nasa.gov/images/pia01959-voyager-2-image-of-saturn

This week鈥檚 new questions

2JP8KPY Very tight parking in Italy with a small dented family car bumper to bumper squashed in next to two cars in a parking bay with only inches to move.

What is the shortest space a parking car can get into?

Split view of a pod of sperm whales in a social group showing the sky and below the waterline, north western Mauritius.; Shutterstock ID 742662229; purchase_order: -; job: -; client: -; other: -

Why don鈥檛 marine mammals like whales get ‘the bends’? Part 2

CRF88E Woman spooning meat into tupperware

This week鈥檚 new questions

2GA52R4 A woman on the beach at Portrush, Co. Antrim, on Northern Ireland's north coast doing open water swimming in the Atlantic Ocean.

When sea swimming, is it better to enter quickly or to take your time?

2K6A82T Artist's concept of astronauts and human habitats on Mars.

What is the minimum number of people needed for a Martian settlement?

purebred beagle puppy is learning the world in first time; Shutterstock ID 566398009; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

Two seagulls above aircraft wing

Do winged animals ever suffer comparable mishaps to aircraft?

Yes they do, say our readers 鈥� everything from hard landings to aerodynamic stalling and wing icing

How long will it be until the pyramids in Egypt weather away?

What makes galaxies spin in a certain direction? Part two

This week鈥檚 new questions

Is there a limit to how small an adult arthropod can be? If so, why?