Telescopes are to astronomers what weapons to defense personnel and the lens size are comparable to ammo size. Larger the telescope better is the capability to capture light and make images. Galileo used the telescope which was small but still was able to spot the phases of the moon, moons of Jupiter, as those were the days, without digital imaging; therefore he drew whatever he saw. But today telescopes store whatever they capture and as the sizes of lenses grow, amount of data also increases posing a threat to the storage of data as no data can be marked bogus since the universe is not known to us, thus we can’t discard or forget whatever we see cause they are pieces of a bigger puzzle. Galileo made the first telescope just 400 years earlier. Galileo’s telescope had a major drawback that it was small thus images were not clear due to low angular resolution (low clarity). Increasing the size of the lens increased the size of the telescope and thus the possibility of bending due to self-load. The greatest Galilean telescope is Palomar 200inch, in fact, it was the biggest for 6 or so decades. But with the advancement in technology and the constraint that manufacturing, transporting, installation, maintenance of too big lenses would be cumbersome or near impossible and also would be uneconomical, innovative ideas were thought about like making clusters of lenses that would act as one. It is still expensive but easy to manage. Ground-based telescopes have seen drastic advancements in the last 2-3 decades but Larger telescopes have good resolution capacity as well as range. Owing to the large lens they are able to capture more light and produce more clear images. But ground-based telescopes aren’t feasible to install due to their large size and heavy maintenance. A slight error could lead millions of taxpayer’s money to go down the drain. Space-based telescopes have seen further fewer advancements since putting a telescope in space is a too risky and expensive task, thus one needs a good reason to do so despite all these astronomers to want to put telescopes in space despite their budgets being humongous because ground-based telescopes have some major drawbacks that no amount of money or technology can overcome. One is the blurring or twinkling of starlight due to turbulent motions in the atmosphere high above. The turbulence in the atmosphere leads to a distorted view of the objects, this turbulence is the reason for the twinkling of lights. Although this twinkling can be reduced by installing a secondary mirror that can fluctuate dozens time per second but still this doesn’t lead to that much clarification that can be observed through space telescopes. The primary mirror can’t be fluctuated due to its enormous size and money invested. And another is the opaqueness of the earth’s atmosphere to many of the wavelengths. Only some wavelengths like visible spectrum and a large part of radio waves and some of the infrared radiation are able to penetrate the earth’s environment. And since the light coming from distant heavenly bodies does not necessarily fall in one of the spectrums due to doppler’s effect that can penetrate the earth’s atmosphere, therefore, it is possible that much of the data we are just losing due the opaque atmosphere present. Also installing a large telescope on the ground requires structure to contain it, and those structures also have initial cost and maintenance cost thus resulting in the cost curve. The universe at every moment leaks loads of data in the form of X-rays, Gamma rays, and Infrared rays just we have to study it that is only possible through space-based telescopes. Thus the curiosity to understand how the universe works, the curiosity to know our origin leads to astronomers putting heavy telescopes in space.