Venus growing new surface?

expanding venus slowing down rotation earth growingVenus rotation appears to have slowed down an incredible amount in only a few years, its days length seems to have reduced by just over six minutes in just over 10 years. This is unexplainable according to current science theories. Unless one set of the data is eventually proven to be wrong.

If Venus's rotation is slowing down as it grows larger (similar to ice skaters when spinning) then is there any possible evidence for new material on the planet?

Venus may have an unexpectedly youthful face, and that's good news for scientists interested in the planet's more modern blemishes. A new look at Venus' craters suggests that the surface might be up to 620 million years younger than previous estimates, a discovery that has implications for signs of relatively recent volcanic activity.

Although it is commonly called Earth's twin due to its similar size and bulk composition, Venus looks nothing like our watery world. It is a hot, desolate place, with over 1,600 major volcanoes or volcanic features—more than any other planet in the solar system. However, it's long been assumed that all its volcanic activity occurred in the past, either in one large burst or several smaller, episodic spasms.

Then last year, scientists studying data taken by the European Space Agency's Venus Express orbiter found four bright spots in a relatively young region known as Ganiki Chasma. The spots seemed to indicate that volcanic activity hadn't quite called it quits on the planet.

According to geologist Patrick McGovern of the Lunar and Planetary Institute in Texas, the surfaces around the volcanic mountains of Venus are thought to be younger than the overall surface of the planet. But with an estimated surface age of up to 800 million years, it wasn't clear whether those volcanoes were spouting lava millions of years ago or a few months ago.
Venus May Have Surprisingly Youthful Skin | Smithsonian Institution

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Science theory originally predicted that the planet Venus was the twin of Earth and that it was old, cold and geologically dead. Due to Venus being the complete opposite (as apparently predicted virtually only by Immanuel Velikovsky and Rupert Wildt) we now have to have the Greenhouse gas theory for Venus, which is now being used for Earth.

The dating of space bodies such as asteroids, active asteroids (comets), moons and planets is normally done by counting the meteoroid impact craters on their surface and how eroded or new they look.

Mercury and the Moon are covered with impact craters; their surfaces are very old. Venus has fewer craters; its surface has been covered recently (in the last 500 million years!) by lava flows that obscured the older craters. Much of Earth's surface is recycled through plate tectonic activity (and erosion), so Earth also has few craters.
How can craters be used to determine the age of a planet or moon? | Lunar and Planetary Institute

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This relies on periods of meteor bombardment including the famous Late Heavy Bombardment of the planets, especially the inner planets. And that all the theories are correct. But there are now growing doubts and evidence about the dating of the Late Heavy Bombardment.

Did the LHB (Earth or lunar cataclysms) actually ever take place? Was it in that relatively short time period?
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Can the dates and theories be trusted as they have not predict successful and a good theory predicts? Could the craters be formed by some other process?

For the Late Heavy Bombardment to have taken place modern science theory is now getting dangerously close to the general ideas (not dates) of Worlds in Collision by Immanuel Velikovsky, with sciences theories of migrating planets.
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When combined with the revised scaling between asteroids and craters, Bottke found that the estimated age for Venus' skin would change significantly: down to about 180 million years old.

"If you have on average a younger surface age for the planet, it means overall that volcanoes are going to be younger than that," McGovern says. "It's an exciting result because it gets us closer to having a more active planet."

McGovern also pointed to research from 2011 that suggested crater floors on Venus are filled with basaltic lavas, leading the authors to estimate a planetary surface age of about 150 million years—close to Bottke's range. According to McGovern, this research is still being debated, which makes the new results even more significant.

"That's vital, coming at it in from an interdisciplinary angle," he says. "Things are converging for a younger Venus."
Venus May Have Surprisingly Youthful Skin | Smithsonian Institution

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Could Earth and Venus have new surface due to them expanding, producing, extruding, revealing new rock/material? Not just a layering from volcano output.

We know basically nothing about the planet and surface of Venus. Any data we have gathered is interpreted and fitted into pre existing theory that was developed before we had any data on the planet.

But Venus hasn't garnered as much attention as planets such as Mars, despite suggestions that it could help researchers understand how life emerged on Earth. That's partly due to the planet's punishing heat and extreme surface pressure, which makes exploration a challenge even for the toughest robots we can fling at it.

Aside from the Russian Venera missions of the late 1970s, most of the recent spacecraft studying the planet have only captured a brief glimpse on their way to other worlds. As a result, planetary scientists have a relatively small collection of images to use for surface studies.
Venus May Have Surprisingly Youthful Skin | Smithsonian Institution