@astro_alexandra

Astro Alexandra

@charmquarkz

Lena Vincent, MS

@chemicalkim

Chemical Kim

@cleoabram

Cleo Abram

@dr.brein

Dr. Ben Rein

@laughterinlight

LaughterInLight, PhD

@norasguidetothegalaxy

Norah's Guide to the Galaxy

@renegadescienceteacher

Forrest Valkai

@scitimewithtracy

Prof. Tracy, PhD

@scishow

SciShow