Calories in Vodka Martini. Calories in Vodka Martini 3 oz. *Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs. Some of these foods were entered by users and are subject to error.
Venus has an atmosphere much denser than Earths, while Mars has an extremely thin atmosphere. All the gas giant planets (Jupiter, Saturn, Uranus, Neptune) have significant atmospheres, as their name implies! Even Pluto, which is not officially a planet anymore, has an atmosphere.
Why are the inner planets are made of rock and free of gas and the outer planets have trapped gas as part of their structure? The planets Venus, Earth, and Mars actually do have thin (as compared to the size of the entire planet) atmospheres. Mercury has a very low-pressure atmosphere. Most of the reason for this is that small planets do not have a gravitational pull strong enough to hold lighter gases in, and they escape to space.