Either by actually seeing it with telescopes, or by seeing the effect that it's gravity has on nearby objects.
Yes, with sensitive instrumentation, almost two thousand planets outside the solar system (exoplanets) have been discovered - and even the first ones in another galaxy. (Note, the human eye cannot see exoplanets unassisted).
I am only going to tell you one because I cant think of another. Christopher Columbus Didn't Discover America.
Two of them in this solar system; Mercury and Venus. Now that a few dozen exoplanets (planets that orbit other stars) have been identified, we're going to have to start being specific about which solar system we mean. Right now, we know next-to-nothing about those exoplanets; only that they exist.
No ---two ways AROUND it No two ways about it
He didn't discover any continents, but an island in the Bahamas.
A scientist and explorer can DISCOVER but a scientist can DISCOVER and INVENT
The Discover Mills mall in Georgia gets its name from the two companies that own it. The two companies that have naming rights are Discover Card and the Mills Corporation.
Yes, efforts to find other planets both in and out of the solar system are ongoing. Almost two thousand have been identified outside the solar system (exoplanets), including the first strong candidates for possible planets in another galaxy. The Kepler mission space telescope continues to gather data to identify exoplanets.
In our solar system Mars is the only planet with two moons. We are not yet aware of moons orbiting exoplanets (planets circling distant stars).
vbhdlfe
with two rocks
A dumb butthead