While many Aussie teenagers were writing fan letters to The Beatles in the 1960s, one Queensland girl was writing to astronauts and eagerly waiting for a reply.

At the time, Michelle Roshanbin was living in Scarborough, north of Brisbane — a long way from NASA in Houston, Texas.

After the Moon landing she could do nothing but talk about space.

"I was such a space nut," she said.

"So I wrote to Neil Armstrong congratulating him and asking him to congratulate the other astronauts involved.

The handwritten letter from Neil Armstrong alongside the National Geographic from 1969. ( ABC Radio Brisbane: Jessica Hinchliffe )

"I did tell him he was wonderful too.

"I was 15 years old and most girls were going after The Beatles, but I was going after the astronauts."

She said when she wrote the letter she never dreamed of receiving a reply.

"We didn't have Google or search engines in those days, so I just addressed my letter with, 'Mr Neil Armstrong, National Aeronautics and Space Administration Houston Texas' and somehow it got there.

"Three months later I got a reply, you never expect something like this to happen to someone in Queensland."

The day the letter arrived, Ms Roshanbin said she remembered her parents did not believe her.

The letter shows Neil Armstrong's signature and note to Michelle. ( ABC Radio Brisbane: Jessica Hinchliffe )

"The postman told me there was a letter for me and I couldn't believe that it had NASA on it," she said.

"I ran into the house yelling out to Mum and Dad but they didn't believe me — I kept looking at it as I really couldn't believe it."

Receiving a letter with a NASA stamp on it

The small letter that arrived from Neil Armstrong was marked with 'National Aeronautics and Space Administration, Houston Texas'.

Neil Armstrong's letter to Ms Roshanbin read:

Dear Michelle, Thank you so much for your kind letter of congratulations on the success of Apollo. I'll give your good wishes to Mike and Buzz. Best wishes for success in the future. Sincerely, Neil Armstrong

"In those days it was such an event and to actually have that particular person — Neil Armstrong — sit down and write me a letter on that NASA notepaper and address it to me was just wonderful," she said.

"I was thrilled to bits and I couldn't believe that someone of his calibre would write back ... I really was a fan girl."

Being part of space history

Ms Roshanbin said she had kept her treasured memento in a safe spot for many decades.

"I feel like I'm part of history, we're all part of it, anyone that saw it was part of it," she said.

"I just have a little bit more history than others.

"I probably shouldn't have laminated it but I wanted to keep it for future generations as it's a lovely reminder of that time."

She admitted she was still in shock five decades later that she received a reply.

A photo of Neil Armstrong on the Moon sits near his handwritten letter at the Queensland Museum. ( ABC Radio Brisbane: Jessica Hinchliffe )

"Armstrong was very private in his personal life and when he was asked about the success of their mission he would say, 'It was fine' he didn't elaborate too much," Ms Roshanbin said.

"He would have had so many letters to reply to and the fact he sat down and replied to as many as he could is amazing."

The letter is now part of the NASA — A Human Adventure Exhibition at the Queensland Museum.

"I feel so proud to see it on display and proud to be part of it," she added.

"I hope this letter has helped support the legacy to the Apollo 11."