科学与环境
Engineers teach spacecraft to 'dream' their way to the space station
来源: Phys.org - latest science and technology news stories · 发布于
Docking with the ISS may seem simple. However, actually doing so shows how difficult orbital mechanics can be. It's like traveling down a highway at 28,000 km/hr (17,000 mph) and parallel parking in an open garage on a multibillion-dollar laboratory traveling at the same speed. I
Docking with the ISS may seem simple. However, actually doing so shows how difficult orbital mechanics can be. It's like traveling down a highway at 28,000 km/hr (17,000 mph) and parallel parking in an open garage on a multibillion-dollar laboratory traveling at the same speed.
If you try to accelerate forward, you actually drift up, and there's no air friction to naturally slow you down. Oh, and if you hit the lab, everyone aboard both your craft and the station dies, and the resulting debris field could wipe out dozens of satellites and even harm people on the ground. No pressure, obviously.
相关报道
A 'library' of bacteria-killing viruses: Harnessing the power of phages
An estimated 38 trillion bacteria live in the human body—and only a small fraction are harmful to our health. However, the harmful ones can cause serious illness, especially when they develop resistance to antibiotics.
Phys.org - latest science and technology news stories ·
Natural proteins can guide active ingredients to diseased cells
After taking a pill, the drugs it contains are distributed throughout the body, reaching the tissues and cells affected by disease and performing their intended function. However, they also enter healthy cells, where they often cause more harm than good.
Phys.org - latest science and technology news stories ·
Laser light enables detection of colorectal cancer biomarker in blood within minutes
Researchers often use antibodies to detect specific molecules or biological markers because they are remarkably precise at recognizing their targets. However, finding the faint signals of cancer in blood samples is a challenge even for the most reliable techniques.
Phys.org - latest science and technology news stories ·
Drones could speed up getting defibrillators to people having cardiac arrests, study suggests
New research suggests the technology could be used to increase out-of-hospital access to life-saving devices Drones could help cut the time it takes to get a defibrillator to people experiencing cardiac arrests when not in hospital, researchers have suggested. In the UK alone, th
World news | The Guardian ·
What is kratom, the 'gas station heroin' alarming officials in the US?
Kratom, found during an investigation into the deaths of two college students, has been sold in the US for around a decade.
feeds.bbci.co.uk ·