New Scientist - 02.18.2020

14 | New Scientist | 8 February 2020

A GROUP of astronomers has

called for legal action to stop

the launch of vast numbers of

satellites designed to beam

high-speed internet around the

world, until their impact on the

night sky can be assessed.

US firm SpaceX has already

launched 240 satellites as part of

its planned Starlink constellation

of up to 42,000 satellites. Others,

such as the UK company OneWeb,

plan to launch hundreds of their

own. There are currently 1500

active satellites orbiting Earth.

Starlink satellites have created

bright streaks in some telescope

images, affecting astronomical

observations. Some worry that the

thousands of bright points of light

could alter the sky for the public

and astronomers forever.

“The ideal thing would be

to stop the deployment of these

kind of satellites until the problem

is very well studied. We have to

understand what the impact is

on the sky,” says Michele Maris at

the Astronomical Observatory of

Trieste in Italy, part of the group

calling for legal action.

To halt mega constellations,

the group says that a case could be

brought to the International Court

of Justice to argue that the night

sky is a shared human right under

the World Heritage Convention.

“The harm here is damage to our

cultural heritage, the night sky,

and monetary damages due to

the loss of radio and other types

of astronomy,” the scientists write

(arxiv.org/abs/2001.10952).

Alternatively, the group says

a case could be filed against

the Federal Communications

Commission (FCC) in the US for

licensing Starlink, which the

astronomers say may have

been in breach of the National

Environmental Policy Act (NEPA).

“It would be desirable to

adopt contingent and limiting

resolutions to be ratified as

shared international rules,” the

astronomers write. They also

suggest that, in the meantime, all

mega constellations should be put

on hold. An associated petition to

temporarily halt further launches

has more than 1400 signatures.

Chris Johnson, a space law

adviser at the Colorado-based

pressure group the Secure World

Foundation, says that the chances

of legal action being successful are

slim, but there is an argument that

could be made.

“It’s time for the larger space

community to think what means

more: ground-based astronomy

and traditional views of the night

sky or cheaper internet from

space,” he says.

The FCC said in a statement it

“strongly reject[ed]” any claims it

has violated NEPA and its approval

of Starlink was “entirely lawful”.

SpaceX has attempted to ease

concerns by testing a Starlink

satellite coated in a darker material

so that it won’t reflect as much

light. However, launches are

ongoing, with SpaceX set to send

up 1500 Starlink satellites in 2020.

“If it is not possible to leave

a better planet for future

generations, we can at least try

not to make it worse,” says group

member Stefano Gallozzi at the

Astronomical Observatory of

Rome in Italy. ❚

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News

SpaceX launched more

Starlink satellites on

29 January

“ When the local

temperature rose, the

pores would simply open

and close on their own”

Robotics

3D-printed robots

can sweat to cool

themselves down

ROBOTS are becoming more

human-like every day, and

now they can sweat.

Thomas Wallin at Cornell

University in New York and

his colleagues have created soft

robotic grippers that are capable

of sweating to cool down.

The grippers can achieve a

cooling capacity of 107 watts

per kilogram, making them more

efficient sweaters than mammals.

By comparison, humans and horses

have a maximum cooling capacity

of about 35 watts per kilogram.

Each gripper consists of three

finger-like parts that bend

simultaneously to grasp small

objects. The 3D-printed grippers

are made from hydrogels, polymer

materials that can store large

amounts of water. Each finger

has an underlayer with an internal

channel to let fluid flow and

is capped with a surface layer

containing micropores.

At cold temperatures, the pores

close. At temperatures higher than

30°C, the surface layer expands,

dilating the pores and enabling

pressurised fluid from the

underlayer to sweat out. The

material responds spontaneously

to temperature changes without

the need for external sensors

(Science Robotics, doi.org/dkvd).

“Sweating takes advantage of

evaporative water loss to rapidly

dissipate heat,” says Wallin. Unlike

convection or radiation, sweating

lowers the temperature of a body

below that of its environment.

“When the local temperature rose

above the transition [temperature],

the pores would simply open and

close on their own,” he says. When

blown by wind from a fan, the

sweating robots cooled at a rate

of 39.1°C per minute, about six

times as fast as similar devices

that are unable to sweat.

However, there is currently no

means to replenish the robot’s fluid

stores after sweating. This means

“the robots would have to also be

able to drink”, says team member

Robert Shepherd, also at Cornell. ❚

Donna Lu

Space

Jonathan O’Callaghan

Astronomers want to halt Starlink

Legal action may be pursued to stop thousands of satellites clogging up the sky