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In the night sky: Orion

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Week 3: From the beginning

Introduction

An image shows the spiral galaxy Messier 81, or M81.

Figure 1 The spiral galaxy Messier 81, or M81.

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This image shows the spiral galaxy Messier 81, or M81.

Figure 1 The spiral galaxy Messier 81, or M81.

This week, you’ll investigate what the night sky can reveal about how it all began. You’ll also learn about different galaxies and find out about dark matter and dark energy.

Next 3.1 The Big Bang

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Week 3: From the beginning

Introduction