51动漫

Regulars

Tom Gauld’s illustrations on the evolution of the headless horseman

Tom Gauld's weekly cartoon

Regulars

Twisteddoodles: ‘I hear the body’s temperature is going up’

Regulars
FEATURE CROP Close up of the air '1765'

Environment

COP26: Exhibition displays air from dawn of the industrial revolution

Regulars
This is the Belt of Orion with its three blue stars across the top of the frame (L to R: Alnitak, Alnilam, and Mintaka), with the iconic Horsehead Nebula (aka B33) below Alnitak, with the dark Horsehead set against the bright nebula IC 434, aka Orion???s Dagger. The pinkish nebula above Alnitak is NGC 2024, the Flame Nebula. The small blue reflection nebula left of the Horsehead is NGC 2023, with smaller IC 435 to the left of it. The field is filled with the large open cluster Collinder 70. The multiple star at bottom left of centre is Sigma Orionis. Many other smaller bits of reflection nebulas populate the field in and around the Belt. This is a blend of 8 x 5-minute exposures at ISO 800 unfiltered with 6 x 10-minute exposures at ISO 1600 shot through an Optolong L-Enhance dual-band nebula enhancement filter (it lets through only Oxygen III blue-green and Hydrogen-alpha red to really enhance the nebulosity). The filtered shot is blended in with the unfiltered shot to retain the best of both worlds: the rich reds captured by the filtered images without losing the range of colours in the other nebulas such as the salmon pinks of the Flame and the blue reflection nebulas and stars. All exposures with the Canon EOS Ra mirrorless camera through the SharpStar HNT150 Hyperbolic Newtonian Astrograph at f/2.8, from home on a very clear moonless night January 27, 2020. All stacked, aligned and blended in Photoshop 2020. (Photo by: Alan Dyer/VW PICS/Universal Images Group via Getty Images)

Space

How to use Orion to find Canis Major and Canis Minor

Regulars
Black rook eating peace of bread; Shutterstock ID 1695627550; purchase_order: -; job: -; client: -; other: -

Is it normal behaviour for rooks to bury bread rather than eat it?

Regulars
An horseshoe magnet.

Do magnets have any effects on human cells?

Regulars

Have we found the answer to the mystery of the impossible rainbow?

Regulars
Spectacled flying fox (Pteropus conspicillatus) baby or bub is cared for by Claudia Barton, volunteer wildlife carer at Tolga Bat Hospital, North Queensland, Australia October 2012

This week鈥檚 new questions

Regulars

What we have learned from making honeybees repeatedly crash into walls

Regulars
FEATURE CROP

Life

Our web-slinging immune cells caught in action for photo contest

A microscrope image showing how the body fights off tuberculosis bacteria has been shortlisted in the Royal Society of Biology's 2021 Photography Competition

Regulars

Do frogs notice when it is raining?

Regulars

What is the most eco-friendly way to deal with our bodies after death?

Regulars

This week鈥檚 new questions

Regulars

Meet Mr Goxx, the crypto-trading hamster beating human investors

Regulars