Desde que alineamos el telescopio, vemos mejor objetos celestes.

Here desde que means since. It introduces a starting point in the past and connects it to something that is still true now.

So the structure is:

Desde que + past event, present situation/result

In this sentence, alineamos el telescopio is the starting point, and vemos mejor objetos celestes is the ongoing result.

Because alineamos can be either:

• present: we align
• preterite (simple past): we aligned

For -ar verbs, the nosotros form is the same in those two tenses.

You know it is past here because of the context. Desde que is introducing an earlier event, and the main verb vemos describes what is true now. So the natural reading is:

Since we aligned the telescope, we see...

Because the sentence is describing a current, ongoing situation.

The idea is not just that something happened in the past; it is that the result continues into the present. Spanish often uses the present tense for that:

Desde que + past event, present tense

So vemos means that now we see celestial objects better, as a result of aligning the telescope.

If you used vimos, it would sound like a finished past event: we saw better not we see better now

Because Spanish usually leaves out subject pronouns when the verb ending already shows who the subject is.

Both alineamos and vemos already tell you the subject is we. So nosotros is unnecessary unless you want emphasis or contrast.

For example:

• Desde que alineamos el telescopio... = normal
• Desde que nosotros alineamos el telescopio... = more emphatic, maybe contrasting with someone else

The sentence is understandable without los, but many native speakers would find vemos mejor los objetos celestes more natural.

Compare:

• vemos mejor objetos celestes = we see celestial objects better / celestial objects are easier for us to see
• vemos mejor los objetos celestes = we see the celestial objects better / we see celestial objects better in general

Without the article, the noun phrase can sound a bit more indefinite or slightly less natural in this context. In careful, neutral Spanish, adding los is often the safer choice:

Desde que alineamos el telescopio, vemos mejor los objetos celestes.

Because mejor is working as an adverb, modifying vemos.

It means better, not better objects.

So:

• vemos mejor = we see better
• objetos celestes = the thing being seen

Spanish often places an adverb like mejor after the verb and before the direct object:

vemos mejor los objetos celestes

That is a very normal position.

Sometimes yes, especially in Spain, if the speaker feels the action belongs to a current time period, such as today or this week.

So these can both be possible depending on context:

• Desde que alineamos el telescopio...
• Desde que hemos alineado el telescopio...

But alineamos is very natural when you are treating the alignment as a completed event that started the present situation.

In other words:

• alineamos = a completed past action
• hemos alineado = a past action with strong connection to the present, often in a current time frame

In this sentence, the simple past works very well.

Yes, if you mean aligning it properly.

That said, in telescope-related contexts, the exact verb depends on what adjustment you mean:

• alinear = align
• enfocar = focus
• ajustar = adjust
• calibrar = calibrate

So alinear el telescopio is fine if the idea is that the telescope was lined up correctly. If you mean making the image sharp, enfocar el telescopio might be more accurate.

Yes. Objetos celestes is understandable and natural enough, especially in scientific or educational language.

Depending on context, you might also hear:

• cuerpos celestes = celestial bodies
• astros = heavenly bodies / stars and other celestial objects

So objetos celestes is perfectly acceptable, but it sounds a little more technical or descriptive than some alternatives.

Because the sentence begins with a subordinate clause:

Desde que alineamos el telescopio

and then moves to the main clause:

vemos mejor objetos celestes

In Spanish, when a clause like this comes first, a comma is very common and natural. It helps separate the time-setting part from the main statement.

You could also reorder the sentence:

Vemos mejor los objetos celestes desde que alineamos el telescopio.

In that version, the comma is usually not needed.