No. The estimated age of the sun and planets is somewhere less than 5 billion years,
whereas
we can see objects in the universe whose age is estimated at 13.5 billion years.
All of the inner planets are rocky planets: Mars, Earth, Venus, and Mercury
All except the inner two.
They thought it could not be taken serious.
Earth is the fifth largest of the eight planets of the Solar System
Hydrosphere.
Considering that earth is not the only planet in the universe and that are many other planets in this same universe, it would almost be egotistical to believe that we are the only inhabitants in the universe on this single planet called Earth. As our technology has advanced to the point of visiting other planets, it would also be egotistical to believe that we are the only beings in the universe with the intelligence to travel among the other planets. It makes sense, therefore, to assume that yes, there could very likely be aliens on the earth either in the future or possibly even in the now.
All of the inner planets are rocky planets: Mars, Earth, Venus, and Mercury
It is included among the inner planets.
All except the inner two.
Among the planets currently considered as "true planets", is is Neptune.
venus
They thought it could not be taken serious.
Earth is the fifth largest of the eight planets of the Solar System
Astronomy is the study of planets and stars, among many other things.
planets
Hydrosphere.
Depends on which planet...