kore ha atarasii hakken desu.

これ means this and refers to something near the speaker.

It often has the sense of this thing or this one. In this sentence, これ is the thing being talked about: this is being identified as a new discovery.

When は is used as the topic particle, it is pronounced wa, not ha.

So:

• これは is read kore wa

This is just a standard spelling convention in Japanese. When は is part of an ordinary word, it is usually pronounced ha.

は marks the topic of the sentence: what the sentence is about.

So これは has the feeling of:

• As for this, ...

Then the rest of the sentence says something about it:

• 新しい発見です = is a new discovery

Japanese often uses a topic + comment structure, which is a little different from how English usually explains sentences.

In Japanese grammar, これ here is best called the topic, because it is marked by は.

In English, it will often translate like the subject, so This is a new discovery feels perfectly natural. But grammatically, Japanese is focusing on what we are talking about first, then making a statement about it.

A very literal way to feel the structure is:

• As for this, it is a new discovery.

Because Japanese adjectives usually come before the noun they modify, just like in English.

So:

• 新しい = new
• 発見 = discovery
• 新しい発見 = new discovery

That part is very straightforward.

Because 新しい is an い-adjective.

い-adjectives can directly modify a noun:

• 新しい本 = a new book
• 新しい発見 = a new discovery

If it were a な-adjective, it would need な before the noun. But 新しい is not that kind of adjective.

Here, 発見 is a noun meaning discovery.

Japanese often makes verbs by combining a noun with する. So:

• 発見 = discovery
• 発見する = to discover / to make a discovery

In this sentence, it is clearly being used as a noun inside 新しい発見.

です is the polite copula.

In sentences like this, it works a lot like English is, but it is not always a perfect one-to-one match. It is better to think of it as the polite way to state that something is something.

So:

• これは新しい発見です。 = This is a new discovery.

It makes the sentence polite and complete.

Japanese does not have articles like a and the.

That means the translator has to choose the most natural English wording based on context. In this sentence, a new discovery is the most natural translation.

So even though there is no separate word for a, the meaning is still there in context.

Yes.

• です = polite
• だ = plain / casual

So both are correct:

• これは新しい発見です。 = polite
• これは新しい発見だ。 = plain / casual

You choose depending on the situation and who you are speaking to.

No. Japanese is usually written without spaces.

The normal writing would be:

• これは新しい発見です。

Spaces are often added in beginner materials to make the parts easier to see and learn.