If, on the other hand, you were on heavy Jupiter, you would weigh a whopping pounds! In order to figure out how heavy a planet is, scientists need to know two things: how long it takes nearby objects to orbit the planet and how far away those objects are from the planet.
For example, the closer a moon is to its planet, the stronger the planet will tug on it. The time it takes an object whether it's a moon or spacecraft to orbit a planet depends both on its distance from the planet and how heavy the planet is. An object's weight is dependent on its mass and how strongly gravity pulls on it. The strength of gravity depends on how far away one object is from another.
Mass stays the same regardless of location and gravity. You would have the same mass on Mars or Jupiter as you do here on Earth. Your weight is different on other planets due to gravity. However, your mass is the same everywhere! We know that Earth has a mass of approximately 5,,,,,,,, kilograms.
If there is an exact known measure in gal - gallons for mercury amount, the rule is that the gallon number gets converted into lb - pounds or any other unit of mercury absolutely exactly. It's like an insurance for a trader or investor who is buying.
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Mercury also boasts hollows —shallow, irregular depressions that seem unique to the planet. Hollows are some of the youngest and brightest features on the surface of Mercury, and range in size from 60 feet to over a mile across and 60 to feet deep.
With no atmosphere, the hollows weren't carved by wind or rain. Instead, they may be caused by volatile minerals evaporating after suddenly being exposed by an impact. But the hollows appear to be younger than the craters in which they are found, and that means Mercury's surface is still evolving in a surprising way. Ironically, the planet closest to the sun contains ice on its surface. It's not the hottest planet; that honor is reserved for Venus.
The northern and southern poles lie in constant shadows, allowing ice to build up on their floor. Eventually, the spacecraft was able peer directly into the craters and confirm that water ice is stable inside them.
Editor's Note: This article was updated on Dec. The original article stated that Mercury's volume is Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community space.
Nola Taylor Tillman is a contributing writer for Space. She loves all things space and astronomy-related, and enjoys the opportunity to learn more.
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