Compared to a type A0 star, a type A9 star is cooler.

Here's why:

The classification of stars into different types is based on their spectral characteristics. The spectral class from hottest to coolest is O, B, A, F, G, K, M. Each class is then subdivided from 0 to 9, with 0 being the hottest and 9 being the coolest.

So, an A0 star is hotter than an A9 star. Therefore, compared to a type A0 star, a type A9 star is cooler.

Question

Compared to a type A0 star, a type A9 star is cooler.

Here's why:

The classification of stars into different types is based on their spectral characteristics. The spectral class from hottest to coolest is O, B, A, F, G, K, M. Each class is then subdivided from 0 to 9, with 0 being the hottest and 9 being the coolest.

So, an A0 star is hotter than an A9 star. Therefore, compared to a type A0 star, a type A9 star is cooler.

Knowee AI · Accepted Answer

Compared to a type A0 star, a type A9 star is cooler.

Here's why:

The classification of stars into different types is based on their spectral characteristics. The spectral class from hottest to coolest is O, B, A, F, G, K, M. Each class is then subdivided from 0 to 9, with 0 being the hottest and 9 being the coolest.

So, an A0 star is hotter than an A9 star. Therefore, compared to a type A0 star, a type A9 star is cooler.

Compared to a type A0 star, a type A9 star isGroup of answer choicesbluer.more massive.hotter.cooler.more luminous.

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