Space Junk: It’s Not As Bad As It Looks (what?)

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According to NASA, these new images of space junk orbiting Earth make the situation look more dire than it really is.

I suppose that would be like a store manager looking at the shop floor of Toys ‘R’ Us on the day after Thanksgiving rubbing his chin and saying, “You see, I told you it would be quiet.” In actuality, the shop would be rammed full of bargain hunters, and by the looks of things, Earth orbit (from LEO to geostationary altitudes) is rammed full of junk.

But space is big, so although it might look a little grim up there, it’s very unlikely a spaceship will collide with anything. A statement from NASA agrees:

The dots are not to scale, and space is a very big place. Collisions between large objects are fairly rare. The orbit of each piece is well known. If any debris comes into the path of an operating NASA satellite, flight controllers will maneuver the satellite out of harm’s way.

This may be the case, but I would argue that as a space-faring race, us humans have barely dipped our toes in the cosmos yet. It’s going to take a lot more rocket launches and space littering before we can have routine access to space. If it looks like this now, in the first decade of the 21st century, how much junk is going to be up there in 20, 50 or 100 years time when manned space flight is commonplace?

We’re already manoeuvring satellites, shuttles and space stations out of harms way, and occasionally satellites do collide. Unfortunately, I think space junk will be an additional man made hazard for space travel; we’ll just have to deal with it.

But for now, be sure to pack your double-glazed Whipple Shield if you intend to take a trip into low-Earth orbit

Source: Space.com

In the Cosmos/Iridium Collision, Which Satellite Won?

©Stratfor Global Intellegence

When two satellites collide at 790 km above the Earth’s surface, who really cares which satellite “won”? It’s going to be a mess; chunks of metal and shards of solar panels exploding to life after their once-solid satellite structures impacted at a velocity of 11 km/s (that’s kilometres per second). Both satellites are losers, twisted, shattered remains of their former selves, cluttering Earth-orbit, causing all kinds of stress for other vehicles flying around in orbit.

However, when the Iridium communications satellite was hit by the defunct Russian Cosmos 2251 on February 10th, it turns out there was a “winner” in the satellite demolition derby (although I am using the word “winner” very loosely)…
Continue reading “In the Cosmos/Iridium Collision, Which Satellite Won?”

It’s Not One-Way Traffic: Satellites Collide at 790 km

© David Clark
© David Clark

On Tuesday, at approximately 5pm GMT, two satellites made history. They became the first artificial satellites ever to collide accidentally in low-Earth orbit. The event happened between a defunct Russian satellite (Cosmos 2251, launched in 1993) and an active commercial Iridium communications satellite (Iridium 33, launched in 1997), destroying the pair. Now there’s a mess up there, pieces of debris threatening other satellites, possibly even the International Space Station
Continue reading “It’s Not One-Way Traffic: Satellites Collide at 790 km”