
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
On October 12, 2022, the third lesson of the "Heavenly Palace Classroom" was held at the Chinese space station. Three astronauts demonstrated experiments such as the capillary effect in a microgravity environment and the "lazy" water droplet experiment. The corresponding video on a short video platform received 1,500,000 likes. Express the number 1,500,000 in scientific notation as ______.

Present the answer in LaTex format: \boxed{Your answer}
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