Earth Day: Let’s Cut Back on Satellites

Posted on by onespaceman2000
Image (Credit): The growth of all tracked objects in space over time. (‘The Case for Space Environmentalism,” Nature, April 22, 2022)

An article in Nature is encouraging a new approach to satellites as we recognize Earth Day. The article, “The Case for Space Environmentalism,” highlights the growth of satellites (estimated to reach more than 100,000 by the end of the decade) and related debris as well as its impact on professional astronomy, public stargazing, and the sustainability of commercial, civic, and military activity in space. The paper states:

We have laid out the argument for the urgent need for orbital space to be considered part of the human environment. Adequately addressing the problems detailed above will require a holistic approach that treats orbital space as part of the environment, and worthy of environmental protection through existing and new policies, rules and regulations at national and international levels. We urge decision makers and policymakers to consider the environmental impacts of all aspects of satellite constellations, including launch, operation and de-orbit, and to work with all stakeholders to co-create a shared, ethical, sustainable approach to space.

This is the perfect day to consider the need to protect the environment on the ground and in the heavens. Happy Earth Day!

Pic of the Week: Stars and Planets over Portugal

Posted on by onespaceman2000
Image (Credit): Night sky in Portugal. (Miguel Claro, The World at Night, Dark Sky Alqueva)

This week’s photo is an amazing night shot in Portugal showing planets, stars, and galaxies. Here is the full description from NASA’s Astronomy Picture of the Day:

The mission was to document night-flying birds — but it ended up also documenting a beautiful sky. The featured wide-angle mosaic was taken over the steppe golden fields in Mértola, Portugal in 2020. From such a dark location, an immediately-evident breathtaking glow arched over the night sky: the central band of our Milky Way galaxy. But this sky had much more. Thin clouds crossed the sky like golden ribbons. The planet Mars appeared on the far left, while the planets Saturn and Jupiter were also simultaneously visible — but on the opposite side of the sky, here seen on the far right. Near the top of the image the bright star Vega can be found, while the far-distant and faint Andromeda Galaxy can be seen toward the left, just below Milky Way’s arch. As the current month progresses, several planets are lining up in the pre-dawn sky: Jupiter, Venus, Mars, and Saturn.

White House: U.S. Anti-Satellite Testing to End

Posted on by onespaceman2000
Image (Credit): The White House. (Whitehouse.gov)

Earlier this week, Vice President Harris announced that the United States will no longer conduct anti-satellite missile testing in space. In her statement, she highlighted the dangers caused by the related satellite debris.

From Vandenberg Air Force Base in California, she stated:

I am pleased to announce that as of today, the United States commits not to conduct destructive direct-ascent anti-satellite missile testing.

Simply put: These tests are dangerous, and we will not conduct them.

We are the first nation to make such a commitment.  And today, on behalf of the United States of America, I call on all nations to join us.

Whether a nation is spacefaring or not, we believe this will benefit everyone, just as space benefits everyone.

In the days and months ahead, we will work with other nations to establish this as a new international norm for responsible behavior in space.  And there is a direct connection between such a norm and the daily life of the American people. 

If a satellite was taken out by debris, it could affect the daily weather forecast, GPS driving directions, and even your favorite TV station.

Critical infrastructure, like wind turbines that power our homes, well, they rely on satellites for connectivity.

Satellites help us track the climate crisis.  They enable our commercial activities.  And they help us protect our troops and our people.

All of this is threatened by the debris created by these reckless tests.

These tests also threaten the lives of astronauts in the International Space Station.

In fact, I spoke earlier this month with Mark Vande Hei who just returned from 355 days in space on the Space Station.  An American record.

While he was in space, Russia conducted its anti-satellite missile test.  He had to shelter in an escape capsule in case the Space Station was hit by debris.

Russia’s action was a threat not just to his life, but also to those of Russian cosmonauts.

Let’s hope other nations are quick to follow. Further discussions and decisions on limiting the number of satellites in low-Earth orbit would also be helpful. That said, it’s a start.

A Day in Astronomy: The Launch of Salyut 1

Posted on by onespaceman2000
Image (Credit): Artist’s drawing of the Soviet Union’s Salyut 1 with a Soyuz spacecraft (upper left) approaching it. (NASA)

On this day in 1971, the Soviet Union launched Salyut 1, mankind’s first space station. The station was visited only once by a Soyuz 11 crew for 24 days, who had to cut their mission short do to technical problems, including an electrical fire. The crew died of asphyxia on the trip back to Earth.

While an earlier Soyuz 10 crew had attempted to dock with the Salyut 1, they were unsuccessful. This unsuccessful docking, followed by the death of the Soyuz 11 crew, led to a redesign of the Soyuz spacecraft. Unfortunately, the new spacecraft could not be launched in time to save the Salyut 1. The station burned up in the Earth’s atmosphere in October 1971.

The Salyut 1 was followed by the successful launch of five more stations, the last one being the Zvezda Service Module, launched in 2000. This module is still in orbit and part of the International Space Station.

Even with all of the issues, it was a great accomplishment for the Soviet Union. The United States did not have its own space station in orbit until the launch of Skylab 1 on May 14, 1973.

No one said space missions were easy or safe, as NASA has also learned over the years.

You can read more about the Soviet and Russian space stations at this NASA site.

Podcast: More on the James Webb Space Telescope

Posted on by onespaceman2000
Image (Credit): Alan Alda’s podcast Clear & Vivid (Amazon)

I wanted to highlight another astronomy interview from Alan Alda’s Clear+Vivid podcast, in this case involving a mother and daughter team. Astronomers Natalie and Natasha Batalha discuss “Looking for Life on Alien Worlds” using the new James Webb Space Telescope. The two guests discuss upcoming efforts to better understand the 5,000+ planets that have already been discovered. One of their favorites among the exoplanet systems is the TRAPPIST-1 system, noting the parent red star is about the size of Jupiter. This small star has seven exoplanets, with the “Goldilocks zone” being much closer in than is the case in our system.

NASA describes one of the exoplanets in the “Goldilocks zone,” TRAPPIST-1d, in this way:

TRAPPIST-1d is one of seven Earth-sized planets in the TRAPPIST-1 system. About 40 light-years from Earth, TRAPPIST-1 is unusual both for its number of small rocky planets and the number in the habitable zone. Several of the artist’s illustrations…portray possible water or ice in the system– the proximity of the planets to their red dwarf star may indicate that any of them could have water on their surface. This artist’s concept shows TRAPPIST-1d with a narrow band of water near the terminator, the divide between a hot, dry day and an ice-covered night side.

You can read more about the TRAPPIST-1 system here.

Image (Credit): Artist’s image of exoplanet TRAPPIST-1d. (NASA)