The cosmic frontier: Why Bangladesh needs a national astronomical observatory

For centuries, the night sky has served as the ultimate laboratory for human curiosity, leading to the development of navigation, timekeeping and our fundamental understanding of physics. 

Yet, as the global community enters a new space age defined by exoplanet discovery and gravitational wave astronomy, Bangladesh finds itself at a crossroads. 

While our neighbours — most notably India and Thailand — have established world-class observing facilities, the scientific community in Bangladesh remains largely restricted to theoretical models and modest, amateur-grade equipment. 

The time has come for a strategic leap. 

Especially after establishing formal education and research in astrophysics at the Independent University, Bangladesh, there is a nationwide demand from the students for hands-on experience in astronomy and astrophysics.

Establishing a National Astronomical Observatory (NAO), centred around a research-grade one-metre class telescope, is no longer a luxury for a developing nation; it is a fundamental requirement for scientific sovereignty and the cultivation of a high-tech workforce.

The power of the one-metre aperture

To the uninitiated, a one-metre telescope might seem small in an era of Extremely Large Telescopes (ELTs) with mirrors spanning 30 metres. However, in the realm of professional astrophysics, the 1.0-metre-class telescope is the workhorse of modern science. It represents the perfect balance between cost-effectiveness and high-performance data acquisition.

A telescope of this scale, when paired with modern digital sensors, has the light-gathering power to observe objects millions of light-years away. It is capable of tracking near-Earth asteroids, monitoring the light curves of distant supernovae, and even detecting the slight dimming of a star as a planet passes in front of it — a process known as transit photometry.

The technical heart of this facility would ideally utilise a Ritchey-Chrétien (RC) optical design. 

This specialised configuration uses two hyperbolic mirrors to eliminate common optical distortions such as coma and spherical aberration. The result is a crisp, flat field of view across a large digital sensor, allowing researchers to capture high-resolution images of expansive star fields. 

Unlike the telescopes found in hobbyist shops, a 1.0-metre RC telescope is a precision instrument designed for quantitative data, not just qualitative viewing. It allows for the measurement of "flux" — the precise amount of light hitting a sensor — which is the foundation of all astrophysical discovery.

Establishing a national astronomical observatory is no longer a luxury for a developing nation; it is a fundamental requirement for scientific sovereignty and the cultivation of a high-tech workforce.

Instrumentation: Beyond the visible eye

A telescope is only as capable as the instruments attached to its focal point. To serve the diverse needs of Bangladesh's universities, the NAO must be equipped with a versatile suite of tools. 

First among these is a large-format, thermoelectrically cooled Charge-Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor (CMOS) camera. By cooling the sensor to temperatures as low as -60°C, researchers can eliminate "thermal noise", allowing them to capture the incredibly faint light of distant galaxies.

Equally vital is the inclusion of a fibre-fed spectrograph. While a camera tells us what an object looks like, a spectrograph tells us what it is made of. By breaking down starlight into its constituent rainbow of colours, or spectrum, scientists can identify the chemical elements present in a star's atmosphere, determine its temperature, and calculate its velocity relative to Earth. 

This is where "big science" happens — measuring the expansion of the universe or the chemical evolution of our galaxy. For physics students in Bangladesh, access to photometric and spectroscopic data from a local observatory would turn astronomy from a theoretical subject into a hands-on scientific experience.

The search for dark skies: Site selection and logistics

The most sophisticated telescope in the world will become useless if it is placed in an unsuitable environment. Bangladesh faces significant challenges in this regard, primarily due to high humidity, seasonal monsoons, and the rampant light pollution of its rapidly growing cities. 

The success of the NAO depends entirely on rigorous site selection. We must look toward the "Dark Sky" pockets of the country, primarily in the southeastern Chittagong Hill Tracts or the northernmost reaches of the Sylhet and Rangpur divisions.

Ideal astronomical sites require "good seeing", a technical term referring to the stability of the atmosphere. High-altitude locations are preferred because there is less air — and therefore less turbulence — between the telescope and the stars. 

Furthermore, the site must be far from the "sky glow" of urban centres like Dhaka or Chattogram. Light pollution from LED streetlights scatters in the atmosphere, washing out the faint light of the cosmos.

Selecting a remote, high-elevation site ensures that the observatory can operate at its theoretical limits. The site would also need reliable high-speed internet and stable electricity, possibly supported by solar power to keep the observatory running during long observation periods.

A national shared resource: The TAC model

Perhaps the most innovative aspect of this proposal is the governance structure. 

The NAO should not belong to a single university or a specific government department. Instead, it must function as a national shared resource, accessible to every accredited institution in Bangladesh. This can be achieved through a Time Allocation Committee (TAC).

Under the TAC model, the academic year is divided into observing "seasons". Any professor or graduate student from any university — public or private — can submit a research proposal outlining what they want to observe and why. 

The TAC, a panel of experts, then reviews these proposals based on their scientific merit. This creates a competitive but fair environment that encourages high-quality research. 

To maximise efficiency, the observatory should be designed for robotic or remote operations. This allows a researcher located in any place to control the telescope in the Hill Tracts via a secure internet connection, downloading data in real-time without the need for expensive and difficult travel to the remote site. 

This "democratisation of the stars" ensures that the best minds in the country have the tools they need, regardless of their institutional funding.

Socio-economic impact and the 'Sputnik Moment'

The investment in a National Astronomical Observatory yields dividends that extend far beyond the ivory towers of academia. Astronomy is a "gateway science" — it is often the first subject that sparks a child's interest in STEM (Science, Technology, Engineering, and Mathematics). 

For Bangladesh, the NAO could provide a "Sputnik moment", a national point of pride that inspires the next generation of engineers, data scientists, and physicists.

From a technical standpoint, the observatory will drive innovation in several key areas. Managing the massive datasets generated by a 1.0-metre telescope requires advanced skills in big data, cloud computing, and artificial intelligence. 

Developing the algorithms to automatically detect moving objects or transient events will train our computer science graduates for roles in the global tech economy. Maintaining such a facility would require skills in precision engineering, mirror coating technology, and cryogenic systems, helping create a specialised industry that currently does not exist in Bangladesh.

A vision for the future

As Bangladesh marches toward its goal of becoming a developed nation by the middle of this century, we must ask ourselves what kind of "developed" nation we wish to be. 

True development is not merely measured by infrastructure and GDP, but by a nation's contribution to the collective knowledge of humanity. By building a National Astronomical Observatory, we provide our scientists with the eyes to see the universe and our students with the inspiration to reach for it.

The stars have always been there, waiting for us to look up. With a one-metre telescope and a committed national strategy, Bangladesh can finally claim its place among the spacefaring and stargazing nations of the world. It is time to move beyond the clouds and secure our scientific future in the cosmos.

Dr Syed Ashraf Uddin is an Associate Professor in the Department of Physical Sciences and a Core Member of the Center for Astronomy, Space Science and Astrophysics at Independent University, Bangladesh.

Disclaimer: The views and opinions expressed in this article are those of the author and do not necessarily reflect the opinions and views of The Business Standard.