Mr. Mohamed Hani from the SAASST Planetarium gave this exciting lecture to showcase the difference between a ground telescope and a space observatory.

Mr. Hani emphasized that ground-based and space-based astronomy have advantages and play complementary roles in our exploration and understanding of the universe.

The advantages of Ground-based astronomy are numerous and can be summarized as:

1. Accessibility: Ground-based telescopes are located on Earth and can be accessed and operated relatively easily. They are spread across various observatories worldwide, allowing scientists from different countries to collaborate and share resources.
2. Cost: Building and maintaining ground-based telescopes is generally less expensive than launching and operating space-based telescopes.
3. Flexibility: Ground-based telescopes can be upgraded and adapted with new instruments and technologies relatively easily compared to space-based telescopes.
4. Large-scale surveys: Ground-based telescopes can conduct large-scale sky surveys, simultaneously observing a wide range of celestial objects.

The advantages of Space-based astronomy are also numerous:

1. Unobstructed view: Earth's atmosphere does not affect space-based telescopes, which can distort and block certain wavelengths of light. They provide a clearer and sharper view of celestial objects.
2. Extended wavelength coverage: Space telescopes can observe a broader range of wavelengths, including ultraviolet and X-rays, which Earth's atmosphere absorbs. This enables them to capture unique information about the universe.
3. Elimination of light pollution: Being above Earth's atmosphere, space telescopes are unaffected by light pollution, allowing for observations of faint and distant objects that would be difficult or impossible to see from the ground.
4. Longer observation times: Space telescopes are not limited by weather conditions, daytime, or light pollution, providing the ability to observe continuously for longer durations.

Ground-based and space-based astronomy have significantly contributed to our understanding of the universe. Ground-based observations are vital for large-scale surveys and monitoring transient events. At the same time, space-based telescopes have provided remarkable images and data from regions of the electromagnetic spectrum that are inaccessible from the ground. The combination of both approaches allows astronomers to explore the cosmos comprehensively.