About 3
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Earth, Mercury, Venus, Mars, Jupiter, Saturn. There were six.
Earth is between Venus and Mars. Well, not really; but the orbit of Earth is between the orbits of Venus and Mars. Venus, Mars and Earth never actually "line up".
Mars orbits the Sun in 687 days. When the Earth and Mars are lined up on one side of the Sun, Mars is at its closest, which is called opposition. After one opposition it takes about 780 days before the next one because it takes that long for the Earth to catch up again with Mars.
Mars' distance from earth varies a lot, it all depends on where the two planets are relative to each other in their different orbits around the sun. The closest that Mars gets to Earth is near the time when they are lined up, with the earth between the sun and Mars. At this point, Mars can be as close as 54 million km (about a third of the Earth to sun distance). When Mars is on the `other side` of the solar system, with the sun between us and Mars, thats when Mars is furthest from Earth (around 400 million km). Watch out for those hoax emails! In 2003 they said that Mars will be at its closest approach for so many years and the planet would look as big as the moon - this was a hoax. Even though it did come closer to the earth for a long time, you would not have noticed it being any bigger or brighter.
After astronauts arrive at Mars they will need to wait 15.4 months for the Earth and Mars to line up right before they launch In order to make it back home.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Earth, Mercury, Venus, Mars, Jupiter, and Saturn, the sun, and the earth's moon.
In astronomical terms, a "day" is the period of time it takes for a planet to make a complete rotation. For us, it's about 24 hours. 1.03 days on Earth is one on Mars. It may not seem like much, but we rotate 2,592 seconds faster than Mars does. This is equivalent to a day 43.2 minutes longer on Mars.
Earth is between Venus and Mars. Well, not really; but the orbit of Earth is between the orbits of Venus and Mars. Venus, Mars and Earth never actually "line up".
Earth, Mercury, Venus, Mars, Jupiter, Saturn. There were six.
Round about 36 million miles (at the closest. Up to 222 million at the farthest.)
Continents make up about 29% of the Earth's surface.
It is impossible to determine the exact number of rocks on Mars as they are distributed across the planet's surface. The number of rocks on Mars would be vast and vary in size from small pebbles to large boulders.
Deserts make up 33% of the earth's land surface.
Venus comes before Earth. Mars comes after Earth.
Mars orbits the Sun in 687 days. When the Earth and Mars are lined up on one side of the Sun, Mars is at its closest, which is called opposition. After one opposition it takes about 780 days before the next one because it takes that long for the Earth to catch up again with Mars.