The first planets ever discovered outside our Solar System were

A: Making their host stars wobble around detectably in the sky
B: Transiting their host stars once every day
C: Brightening background stars via microlensing
D: In orbit around a millisecond pulsar, not a normal star
E: Making their host stars wobble around such that the velocity could be detected by the Doppler Effect


Answer: D: In orbit around a millisecond pulsar, not a normal star

Physics & Space Science

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In 1998 came the discovery of ________, which seems to overwhelm even gravity and all the dark matter in the final fate of the cosmos

Fill in the blank(s) with correct word

Physics & Space Science

The energy required to move an electron in a hydrogen atom from energy level 1 to energy level 2 is:

A) 10.2 eV. B) 12.1 eV. C) 12.75 eV. D) 13.1 eV. E) 13.6 eV.

Physics & Space Science

The _________________ hypothesis includes mergers with smaller galaxies and infalling gas to the standard formation of the Milky Way galaxy

Fill in the blank(s) with correct word

Physics & Space Science

Organisms designated as producers usually obtain their energy from:

a. other producers b. dead consumers c. decomposers d. the environment e. themselves

Physics & Space Science