Challenge 5. Outer Defenses Crushed. Chapter 6: That Shrinking Feeling flex-shrink. Chapter 6. Into the Labyrinth. O Snap They Can Shrink flex-shrink: 1. The Path of Least Resistance flex-shrink default. Generous Little Goo flex-shrink: 3. No Shrink For You flex-shrink: 0. I'm Not Your Shrink. Challenge 6. The Point of No Return. Chapter 7: In a Perfect World flex-basis. Chapter 7. The Ideal Size. Gotta Start Somewhere flex-basis: px.
Basis Trumps Width width vs flex-basis. What About Min Width? What About Max Width? Not Just For Width vertical flex-basis. No Guarantees flex-basis as ideal size. On Auto Pilot flex-basis: auto. Just a Starting Point.
Challenge 7. Getting Closer. Chapter 8: Out of Order order. Chapter 8. Ready for Anything. Order Matters order: 1. Back of the Line! Front of the Line! Numbers Game ascending order. Order First. Challenge 8. Run Away!!!
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Chapter 9: Get Your Own Line flex-wrap. Chapter 9. Devil's Gate. Plenty of Room flex-wrap: wrap.
Screaming zombies, kissing stars: NASA’s list of space phenomena now includes “burping”
Only When We Have To flex-wrap: wrap. Vertical Wrap vertical flex-wrap. Reverse All the Things flex-wrap: wrap-reverse. Power of the Wrap. Challenge 9. Victory on the Horizon.
Space Pirates and Zombies
Chapter Read Between the Lines align-content. Chapter Desperate Measures. Stretchy Lines align-content: stretch. Up Top align-content: flex-start.
About This Game
Down Low align-content: flex-end. Same as Reading vertical align-content: flex-end. Bunch in the Middle align-content: center. Space Around the Lines align-content: space-around. Read Between the Lines align-content: space-between. How the Lines Align. Challenge This is It. A Faster Way. The Flex flex: grow, shrink, basis. Just Grow Yo flex: grow. I'm All About that Basis flex: basis. By Stuart Clark. It is nothing but space junk, smashed-up debris from thousands of satellites that once monitored our climate, beamed down TV programmes and helped us find our way around.
Back in , he and colleague Burton Cour-Palais proposed that as the number of satellites rose, so would the risk of accidental collisions.
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Such disasters would create large clouds of shrapnel, making further collisions with other satellites more likely and sparking a chain reaction that would swiftly surround the Earth with belts of debris. Orbits would become so clogged as to be unusable and eventually our access to space would be completely blocked.
On 10 February it started to happen. In the first collision between two intact satellites, the defunct Russian craft Kosmos struck communications satellite Iridium 33 at a speed of 42, kilometres per hour. Kosmos was utterly destroyed. The collision may also have produced hundreds of thousands of smaller fragments, which cannot currently be tracked from Earth.
Such debris is a serious worry. With satellites travelling at tens of thousands of kilometres per hour, any encounter with debris could be lethal. Protective covers and the explosive bolts used to separate them from uncrewed spacecraft have also been left to float away, along with a few lens caps for good measure. Some of these objects re-enter the atmosphere and burn up, but most are still up there. The SSN has catalogued 12, objects in Earth orbit that are at least 10 centimetres in size, about three-quarters of which are space junk.
Every rocket launch creates yet more space debris, edging us ever closer to the Kessler syndrome becoming a reality. So what can be done? For a start, we can try not to make the problem worse. This can be as simple as ensuring that protective covers are tethered to spacecraft rather than jettisoned.
These require, for example, that spacecraft in low Earth orbit must be made to re-enter the atmosphere and burn up within 25 years of finishing their missions. Communications satellites in the high-altitude geostationary orbit cannot be brought down practically. Twelve satellites in geosynchronous orbit failed in , but only seven were boosted in accordance with the guidelines. And more than of the trackable objects near the geostationary corridor are not active satellites.
Even if the guidelines were followed to the letter, the number of debris fragments would still go up. Kessler predicted that if nothing were done to remove debris, we would begin to suffer the consequences in As it turned out, the Iridium and Kosmos collision did not happen for another nine years. The main reason for our period of grace may be that modern satellites are manoeuvrable. Such ducking and dodging used to be rare. Not any longer.
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A few years ago, operators were receiving one or two warnings of space debris a month; now it can be two or three times a week. Every time a new warning comes in, they must begin a hour tracking campaign using ground-based radar to refine the orbit of the object and establish whether to take evasive action or not. It was an ostentatious display of military capability, perhaps intended as a warning to anyone thinking of putting weapons into space, but it also sent shock waves through space operations centres around the world.
That incident, in combination with the Iridium smash in , created so much debris that the number of fragments in low Earth orbit large enough to be tracked from the ground almost doubled. Some craft are more vulnerable to debris than others, says Lewis, who has developed software to model how space junk spreads and evolves over time.
Take the A-train — four satellites that orbit Earth one behind the other, monitoring the atmosphere as they go. The closest pair are just 15 seconds apart, and this proximity makes the A-train especially vulnerable. As things stand, remediation — as space engineers call it — is a necessity. In other words, someone will have to go up there and bring the stuff down.
But which bits?
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Who will do it? How will they do it? And who is going to pay?