What would an Earth-like binary system be like?

I've been interested in binary systems lately, and I was recently wondering what Earth would be like if it was in a binary orbit with another Earth-like planet.

Both planets exhibit the following characteristics.

• Approximately equal size. (~12,000km diameter)
• Same atmosphere composition, nitrogen (~78%), oxygen (~21%), and other various gases.
• Population of sentient beings with ~21st century technology, and the spaceflight technologies of today. (Manned craft in Earth orbit, and probes across the solar system.)
• No moon(s).

I have these two questions:

• How would these beings communicate?
• What would spaceflight be like?

posted over 9 years ago

Ethan Bierlein‭

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