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Why is it hard to take a high quality image of far away objects (like Pluto from) using a high-tech space telescope?

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Why did NASA send a probe so close to Pluto instead of using a high-tech telescope to capture images of its surface?

enter image description here

The Icy Mountains of Pluto. Image credit: New Horizons / Johns Hopkins Applied Physics Laboratory, July 15, 2015

I always imagined its possible to take at least low-quality pictures of tiny little things from far far away using a space telescope. But to be honest, I got confused seeing latest pictures of Pluto taken by New Horizons, and I actually don't understand why we couldn't take such low-quality images without sending an entire probe close to Pluto?

I understand that it's impossible to take such picture from this angle from Earth or telescopes close to Earth, but the image quality is poor comparing to Hubble images (the ones taken from deep space) or other similar images of other planets (like Mars, Saturn or Moon or even planets from other solar systems).

Why did NASA send a probe so close to Pluto instead of using a high-tech telescope to capture images of its surface?

enter image description here

The Icy Mountains of Pluto. Image credit: New Horizons / Johns Hopkins Applied Physics Laboratory, July 15, 2015

I always imagined its possible to take at least low-quality pictures of tiny little things from far far away using a space telescope. But to be honest, I got confused seeing latest pictures of Pluto taken by New Horizons, and I actually don't understand why we couldn't take such low-quality images without sending an entire probe close to Pluto?

I understand that it's impossible to take such picture from this angle from Earth, but the image quality is poor comparing to Hubble images or other similar images of other planets.

Why did NASA send a probe so close to Pluto instead of using a high-tech telescope to capture images of its surface?

enter image description here

The Icy Mountains of Pluto. Image credit: New Horizons / Johns Hopkins Applied Physics Laboratory, July 15, 2015

I always imagined its possible to take at least low-quality pictures of tiny little things from far far away using a space telescope. But to be honest, I got confused seeing latest pictures of Pluto taken by New Horizons, and I actually don't understand why we couldn't take such low-quality images without sending an entire probe close to Pluto?

I understand that it's impossible to take such picture from this angle from Earth or telescopes close to Earth, but the image quality is poor comparing to Hubble images (the ones taken from deep space) or other similar images of other planets (like Mars, Saturn or Moon or even planets from other solar systems).

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source | link

Why did NASA send a probe so close to Pluto instead of using a high-tech telescope to capture images of its surface?

enter image description here

The Icy Mountains of Pluto. Image credit: New Horizons / Johns Hopkins Applied Physics Laboratory, July 15, 2015

I always imagined its possible to take at least low-quality pictures of tiny little things from far far away using a space telescope. But to be honest, I got confused seeing latest pictures of Pluto taken by New Horizons, and I actually don't understand why we couldn't take such low-quality images without sending an entire probe close to Pluto?

I understand that it's impossible to take such picture from this angle from Earth, but the image quality is poor comparing to Hubble images or other similar images of other planets.

Why did NASA send a probe so close to Pluto instead of using a high-tech telescope to capture images of its surface?

enter image description here

The Icy Mountains of Pluto. Image credit: New Horizons / Johns Hopkins Applied Physics Laboratory, July 15, 2015

I always imagined its possible to take at least low-quality pictures of tiny little things from far far away using a space telescope. But to be honest, I got confused seeing latest pictures of Pluto taken by New Horizons, and I actually don't understand why we couldn't take such low-quality images without sending an entire probe close to Pluto?

I understand that it's impossible to take such picture from this angle from Earth, but the image quality is poor comparing to Hubble images or other similar images of other planets.

Why did NASA send a probe so close to Pluto instead of using a high-tech telescope to capture images of its surface?

enter image description here

The Icy Mountains of Pluto. Image credit: New Horizons / Johns Hopkins Applied Physics Laboratory, July 15, 2015

I always imagined its possible to take at least low-quality pictures of tiny little things from far far away using a space telescope. But to be honest, I got confused seeing latest pictures of Pluto taken by New Horizons, and I actually don't understand why we couldn't take such low-quality images without sending an entire probe close to Pluto?

I understand that it's impossible to take such picture from this angle from Earth, but the image quality is poor comparing to Hubble images or other similar images of other planets.

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