Which planet in our solar system is closest in size to earth?

Venus is very close in diameter to the Earth.

Venus

venus is the closest in size to the earth

Venus and Mercury

Venus.
Sometimes called Earth's Evil Twin.
It has some pretty wild weather there, 200mph winds and acid rain, atmosphere is a heavy 50 miles thick carbon dioxide.
Temperature is about 800 C.
Once thought to be slightly bigger than Earth, but that was before probes saw how thick the atmosphere was, surfacewise Venus is slightly smaller in volume than Earth, it has 5/8ths less mass too.

Venus - sometimes called 'Earth's twin' - just about 120 miles less in diameter than Earth.

Venus.

Venus is like a soccer ball and Earth is like a basketball.

Got it!
Hope it helps!?

@Anonymous
Mercury is heavy and dense, but it isn't the closest size.

Venus.

Venus is a bit smaller and about 2/3 as massive.

Well, ..., Venus is the only planet, in our solar system, that is closest in size to Earth.

See the link below for details.

Earth's gravity is 1. Or do you mean the gravitational acceleration? It's 9.78 meters per second squared. Regardless, it wouldn't matter if a black hole got close to the solar system, it would in no way affect Earth's gravity. Gravity is a function of mass. The only way Earth's gravity can increase is if the Earth has more mass added to it. The only way Earth's gravity can decrease is if it looses mass. The same goes for every object in the universe.

I don't know and I don't care. Oh my goodness what is that smell? Your breath stinks man brush your teeth and take a bath. I'm glad Satan is destroying the world.

"The guy who stands on the corner singing stupid songs with his guitar case open,expecting people to throw money into it."

Why? The guy on the corner sings better songs than Justin Bieber. And the guy on the corner is homeless and needs the money more than Bieber. The fact that a Belieber would punch out a homeless person makes me question your morals.

It is Venus. Mars is second.

Venus

http://www.google.com/search?hl=en&site=webhp&tbm=isch&source=hp&ei=-0NFVMWgCK-t8gHMxICoDg&q=solar+system&oq=solar+system&gs_l=mobile-gws-hp.12...0.0.0.27959.0.0.0.0.0.0.0.0..0.0....0...1c..56.mobile-gws-hp..0.0.0.T-J7RYQCnms#facrc=_&imgrc=neHB2huv6Gau8M%253A%3B2wpUIdC8vIriHM%3Bhttp%253A%252F%252F1.bp.blogspot.com%252F-mA1oK2IIrGo%252FUMqj155kWyI%252FAAAAAAAAEus%252FcbsVlTAHCAE%252Fs1600%252Fcl8_Sci_solor_system.jpg%3Bhttp%253A%252F%252Fcbse-notes.blogspot.com%252F2011%252F12%252Fclass-8-ch17-stars-and-solar-system.html%3B468%3B157

google is your friend

Earth.