SpaceX launches third batch of Starlink satellites
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FRIDAY, AUGUST 12, 2022
SpaceX launches third batch of Starlink satellites

Science

BSS/AFP
07 January, 2020, 11:25 am
Last modified: 07 January, 2020, 11:47 am

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SpaceX launches third batch of Starlink satellites

There are currently around 2,100 active satellites orbiting our planet according to the Satellite Industry Association

BSS/AFP
07 January, 2020, 11:25 am
Last modified: 07 January, 2020, 11:47 am
A SpaceX Falcon 9 rocket, carrying the Israeli-owned Amos-17 commercial communications satellite, lifts off from the Cape Canaveral Air Force Station in Cape Canaveral/ Reuters
A SpaceX Falcon 9 rocket, carrying the Israeli-owned Amos-17 commercial communications satellite, lifts off from the Cape Canaveral Air Force Station in Cape Canaveral/ Reuters

SpaceX on Monday launched its third batch of 60 mini-satellites into orbit, part of its plans to build a giant constellation of thousands of spacecraft that will form a global broadband internet system.

A live broadcast by SpaceX showed a Falcon 9 rocket taking off without incident from Cape Canaveral, Florida at 9:19 pm (0219 GMT Tuesday).

The satellites are set to release about one hour after takeoff, bringing the total number of satellites that are part of the US company's Starlink network to just under 180.

But that figure could one day total 42,000, resulting in far more crowded skies, which has raised concerns among astronomers that they may one day threaten our view of the cosmos.

To put that into context, there are currently around 2,100 active satellites orbiting our planet, according to the Satellite Industry Association.

The launch was broadcast live by SpaceX, a company created by tycoon Elon Musk, who is also chief executive of Tesla.

SpaceX's goal is to control a huge share of the future internet market from space. Several rivals have the same ambition, including London-based startup OneWeb and giant US retailer Amazon, whose Project Kuiper is far less advanced.

Musk hopes eventually to control three to five percent of the global internet market — a share valued at $30 billion a year, or 10 times what SpaceX is earning from its space launches, and plough the profits back into rocket and spaceship development.

SpaceX's boss also entertains a long-time dream of colonizing Mars.

Astronomy concerns

His California-based company has so far received US authorization to launch 12,000 satellites in several different orbits, and it has applied to launch as many as 30,000 more.

SpaceX says its satellite constellation will be operational for Canada and the northern US by next year.

Astronomers say the proliferation of the bright metallic satellites could seriously degrade the night view, interfering with both optical and radio astronomy.

But SpaceX argues it has taken steps to reduce the satellites' reflectivity and is testing an experimental darkening treatment on one of the satellites.

Laura Forczyk, a space analyst, said the measures' effectiveness was still uncertain.

"SpaceX has not yet eased the minds of astronomers concerned about the reflectivity of their Starlink satellites," she told AFP.

"The real test will be the days following launch when the smallsats are close together and in a lower altitude before ascending to their final orbit. Astronomers and stargazers will be able to compare the brightness of this current batch of smallsats compared to previous versions."

Another criticism of more crowded skies is it will result in expensive collisions between satellites, potentially creating thousands of pieces of new space junk.

SpaceX says it has a plan for that, too: its Starlink satellites deploy at an altitude of 290 kilometers (180 miles) and then engage their ion thrusters to reach an orbit of 550 kilometers (340 miles).

At the end of their life-cycles, the satellites will use their propulsion systems to de-orbit over the course of a few months — or if these fail, they will burn up naturally in the atmosphere in under five years, compared to the thousands of years required at higher altitudes.

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