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Astronomy | Astrophysics
We know the universe is 13.7 billion years old, is this the age of the Universe or just our observable universe. Space is most likely infinite, so how does infinite space have an age if its infinite to begin with. For example, something that is 47 billion light years away isnt 47 billion years old, since space is expanding and math can tell us that, averaged out with the expansion speed, the oldest objects can be IS 13.7 billion years old. But something that is outside our observable universe can be much much farther away from us, so it confuses me to think that with something so far away from us that the universe is STILL 13.7 billion years. Can i please have some clarification?
Astronomy | Astrophysics
5) Assuming that half of the mass of the Milky Way within the Sun's orbit is in the bulge, estimate the average mass density of the Milky Way's bulge. How does it compare with the density of giant molecular clouds?
Astronomy | Astrophysics
What force acts to hold this massive object in orbit around the Sun? What direction does this force act
Astronomy | Astrophysics
If the asteroid is moving at a constant speed in its orbit, why will it have a normal acceleration
Astronomy | Astrophysics
calculate the magnitude of the acceleration due to gravity on planet mercury mass = 2.99 x 10(power 23)kg and radius = 2.42 x 10(power 6) metres.
Astronomy | Astrophysics
Star S2 has been observed orbiting around Sgr A* at the center of the Milky Way. At closest approach it is 17 light hours from Sgr A*, with a velocity of 5000 km/s. Assuming a circular orbit for S2, calculate the mass of the black hole at the center of the Milky Way
Astronomy | Astrophysics
Is it possible to make adibatic wall????
Astronomy | Astrophysics
what is present in mass that pulls another body.
Astronomy | Astrophysics
Titan’s size (R = 2575 km) and density (ρ = 1.9 g cm -3) are much smaller than Earth’s (R = 6378 km and ρ = 5.5 g cm -3). Therefore, we would expect that its surface gravity gT is weaker than Earth’s g, so any material on Titan would weigh much less than it does on Earth (the weight of any mass m on any planet (or moon) is given by the product of its mass m and surface gravity g, i.e., W = mg). However, atmospheric pressure on Titan’s surface is greater than Earth’s, about 1.6 Earth atmospheres (pressure is the weight per square meter on the surface of the planet (or moon), i.e., P = W / A where A is the area)! This means that the amount of mass in Titan’s atmosphere above any square meter of Titan’s surface must be much greater than the amount of mass in the atmosphere of Earth above any square meter on Earth’s surface. Calculate the amount mass of atmosphere per square meter (we’ll call this σ = m/A) on Titan’s surface compared to that on Earth. (Hint: You’ll need to calculate Titan’s surface gravity relati
Astronomy | Astrophysics
If a plane goes 1500 mph what speed will it go in space?
