Complete the astronaut's transmission to Earth by dropping the right words into her report.

We just installed a new telescope on the space station. It took almost an hour to set up, but now we have a perfect view of the moon glowing brightly against the darkness!

We just installed a new telescope on the space station.

We use "a" because this is a general, non-specific telescope being mentioned for the first time, and "new" starts with a consonant sound.

It took almost an hour to set up...

We use "an" before "hour" because even though it starts with the consonant letter "h", the "h" is silent. It begins with a vowel sound ("our").

...but now we have a perfect view of the moon glowing brightly against the darkness!

We use "the" for unique objects. There is only one moon orbiting Earth, so it takes the definite article.