The galactic centre

A globular cluster

measuring its recession speed

It is impossible to tell from the data given

There is no relationship between redshift and recession velocity

Blue light

By observing the redshift of the Andromeda galaxy

The origin of galaxies

The origin of atomic nuclei

The origin of space-time

The origin of life in the Universe

The origin of hydrogen

expanding.

eternal and unchanging with an infinite number of stars.

more than 20 billion years old.

infinite in size.

less, because energy is conserved and if it experiences more gravity when it is closer to the Sun, its momentum must be lower.

greater, because it is closer to the Sun and will experience a greater gravitational attraction to the Sun.

the same, because angular momentum is the same along all points in Earth’s orbit.

greater, because its orbital speed is higher when it is closer to the Sun.

less, because it will travel slower when it is closer to the Sun.

the same, because Earth’s orbit is circular and its distance from the Sun doesn’t change.

No

Yes